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  • data ownership and performance

    - by Ami
    We're designing a new application and we ran into some architectural question when thinking about data ownership. we broke down the system into components, for example Customer and Order. each of this component/module is responsible for a specific business domain, i.e. Customer deals with CRUD of customers and business process centered around customers (Register a n new customer, block customer account, etc.). each module is the owner of a set of database tables, and only that module may access them. if another module needs data that is owned by another module, it retrieves it by requesting it from that module. so far so good, the question is how to deal with scenarios such as a report that needs to show all the customers and for each customer all his orders? in such a case we need to get all the customers from the Customer module, iterate over them and for each one get all the data from the Order module. performance won't be good...obviously it would be much better to have a stored proc join customers table and orders table, but that would also mean direct access to the data that is owned by another module, creating coupling and dependencies that we wish to avoid. this is a simplified example, we're dealing with an enterprise application with a lot of business entities and relationships, and my goal is to keep it clean and as loosely coupled as possible. I foresee in the future many changes to the data scheme, and possibly splitting the system into several completely separate systems. I wish to have a design that would allow this to be done in a relatively easy way. Thanks!

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  • Does NSClassFromString affect performance?

    - by Tomen
    I want to create a controller that depends on the class of a given instance of a model -(BaseController *)getControllerForModel:(Model *)model { BaseController *controller = nil; Class controllerClass = [BaseController class]; //the default value //find the right controller if ([model isMemberOfClass:[ModelClass1 class]]) controllerClass = [ConcreteController1 class]; else if ([model isMemberOfClass:[ModelClass2 class]]) controllerClass = [ConcreteController2 class]; else if ([model isMemberOfClass:[ModelClass3 class]]) controllerClass = [ConcreteController3 class]; ... else if ([model isMemberOfClass:[ModelClassX class]]) controllerClass = [ConcreteControllerX class]; else Trace(TRACELEVEL_WARNING, @"Unrecognized model type: %@", NSStringFromClass([model class])); //Now instantiate it with the model controller = [[[controllerClass alloc] initWithModel:model] autorelease]; return slotController; } I want to find a more flexible solution to this and thought of having a dictionary, which maps Model-Classes to Controller-Classes and then NSClassFromString could give me the right instance. My question is this: Is NSClassFromString using much of my applications performance if i use it several times (say, 100 times at once)? Or would it be about as fast as the above approach?

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  • Performance difference between functions and pattern matching in Mathematica

    - by Samsdram
    So Mathematica is different from other dialects of lisp because it blurs the lines between functions and macros. In Mathematica if a user wanted to write a mathematical function they would likely use pattern matching like f[x_]:= x*x instead of f=Function[{x},x*x] though both would return the same result when called with f[x]. My understanding is that the first approach is something equivalent to a lisp macro and in my experience is favored because of the more concise syntax. So I have two questions, is there a performance difference between executing functions versus the pattern matching/macro approach? Though part of me wouldn't be surprised if functions were actually transformed into some version of macros to allow features like Listable to be implemented. The reason I care about this question is because of the recent set of questions (1) (2) about trying to catch Mathematica errors in large programs. If most of the computations were defined in terms of Functions, it seems to me that keeping track of the order of evaluation and where the error originated would be easier than trying to catch the error after the input has been rewritten by the successive application of macros/patterns.

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  • Hive performance increase

    - by Sagar Nikam
    I am dealing with a database (2.5 GB) having some tables only 40 row to some having 9 million rows data. when I am doing any query for large table it takes more time. I want results in less time small query on table which have 90 rows only-- hive> select count(*) from cidade; Time taken: 50.172 seconds hdfs-site.xml <configuration> <property> <name>dfs.replication</name> <value>3</value> <description>Default block replication. The actual number of replications can be specified when the file is created. The default is used if replication is not specified in create time. </description> </property> <property> <name>dfs.block.size</name> <value>131072</value> <description>Default block replication. The actual number of replications can be specified when the file is created. The default is used if replication is not specified in create time. </description> </property> </configuration> does these setting affects performance of hive? dfs.replication=3 dfs.block.size=131072 can i set it from hive prompt as hive>set dfs.replication=5 Is this value remains for a perticular session only ? or Is it better to change it in .xml file ?

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  • MySQLi Wrapper -- will this slow down performance?

    - by Kerry
    I found the following code on php.net. I'm trying to write a wrapper for the MySQLi library to make things incredibly simple. If this is going to slow down performance, I'll skip it and find another way, if this works, then I'll do that. I have a single query function, if someone passes in more than one variable, I assume the function has to be prepared. The function that I would use to pass in an array to mysqli_stmt_bind_param is call_user_func_array, I have a feeling that is going to slow things down. Am I right? <?php /* just explaining how to call mysqli_stmt_bind_param with a parameter array */ $sql_link = mysqli_connect('localhost', 'my_user', 'my_password', 'world'); $type = "isssi"; $param = array("5", "File Description", "File Title", "Original Name", time()); $sql = "INSERT INTO file_detail (file_id, file_description, file_title, file_original_name, file_upload_date) VALUES (?, ?, ?, ?, ?)"; $sql_stmt = mysqli_prepare ($sql_link, $sql); call_user_func_array('mysqli_stmt_bind_param', array_merge (array($sql_stmt, $type), $param); mysqli_stmt_execute($sql_stmt); ?>

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  • Webalizer causing high CPU load

    - by Tom
    We use webalizer to generate reports on our Apache access logs - it is useful in conjunction with Google Analytics. The problem is that webalizer uses ALOT of CPU when running. If I run top I can see two perl processes with 90% CPU - this slows down the machine and therefore the website for our users. Webalizer is run via a daily cron job (/etc/cron.daily/00webalizer): #! /bin/bash # update access statistics for the web site if [ -s /var/log/httpd/access_log ]; then exec /usr/bin/webalizer -Q fi Does anyone know how to limit how much CPU webalizer can use? For example, would nice help and how would I use it?

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  • apt-get install and update fail

    - by sepehr
    I've got a problem with apt-get update and apt-get install ... commands . every time update or installing fails and errors are : Get:1 http://dl.google.com stable Release.gpg [198B] Ign http://dl.google.com/linux/chrome/deb/ stable/main Translation-en_US Get:2 http://dl.google.com stable Release [1,347B] Get:3 http://dl.google.com stable/main Packages [1,227B] Err http://32.repository.backtrack-linux.org revolution Release.gpg Could not connect to 32.repository.backtrack-linux.org:80 (37.221.173.214). - connect (110: Connection timed out) Err http://32.repository.backtrack-linux.org/ revolution/main Translation-en_US Unable to connect to 32.repository.backtrack-linux.org:http: Err http://32.repository.backtrack-linux.org/ revolution/microverse Translation-en_US Unable to connect to 32.repository.backtrack-linux.org:http: Err http://32.repository.backtrack-linux.org/ revolution/non-free Translation-en_US Unable to connect to 32.repository.backtrack-linux.org:http: Err http://32.repository.backtrack-linux.org/ revolution/testing Translation-en_US Unable to connect to 32.repository.backtrack-linux.org:http: Err http://all.repository.backtrack-linux.org revolution Release.gpg Could not connect to all.repository.backtrack-linux.org:80 (37.221.173.214). - connect (110: Connection timed out) Err http://all.repository.backtrack-linux.org/ revolution/main Translation-en_US Unable to connect to all.repository.backtrack-linux.org:http: Err http://all.repository.backtrack-linux.org/ revolution/microverse Translation-en_US Unable to connect to all.repository.backtrack-linux.org:http: Err http://all.repository.backtrack-linux.org/ revolution/non-free Translation-en_US Unable to connect to all.repository.backtrack-linux.org:http: Err http://all.repository.backtrack-linux.org/ revolution/testing Translation-en_US Unable to connect to all.repository.backtrack-linux.org:http: Ign http://32.repository.backtrack-linux.org revolution Release Ign http://all.repository.backtrack-linux.org revolution Release Ign http://32.repository.backtrack-linux.org revolution/main Packages Ign http://all.repository.backtrack-linux.org revolution/main Packages Ign http://32.repository.backtrack-linux.org revolution/microverse Packages Ign http://32.repository.backtrack-linux.org revolution/non-free Packages Ign http://32.repository.backtrack-linux.org revolution/testing Packages Ign http://all.repository.backtrack-linux.org revolution/microverse Packages Ign http://all.repository.backtrack-linux.org revolution/non-free Packages Ign http://all.repository.backtrack-linux.org revolution/testing Packages Ign http://32.repository.backtrack-linux.org revolution/main Packages Ign http://32.repository.backtrack-linux.org revolution/microverse Packages Ign http://32.repository.backtrack-linux.org revolution/non-free Packages Ign http://all.repository.backtrack-linux.org revolution/main Packages Ign http://all.repository.backtrack-linux.org revolution/microverse Packages Ign http://all.repository.backtrack-linux.org revolution/non-free Packages Ign http://all.repository.backtrack-linux.org revolution/testing Packages Err http://all.repository.backtrack-linux.org revolution/main Packages Unable to connect to all.repository.backtrack-linux.org:http: Err http://all.repository.backtrack-linux.org revolution/microverse Packages Unable to connect to all.repository.backtrack-linux.org:http: Ign http://32.repository.backtrack-linux.org revolution/testing Packages Err http://32.repository.backtrack-linux.org revolution/main Packages Unable to connect to 32.repository.backtrack-linux.org:http: Err http://32.repository.backtrack-linux.org revolution/microverse Packages Unable to connect to 32.repository.backtrack-linux.org:http: Err http://all.repository.backtrack-linux.org revolution/non-free Packages Unable to connect to all.repository.backtrack-linux.org:http: Err http://all.repository.backtrack-linux.org revolution/testing Packages Unable to connect to all.repository.backtrack-linux.org:http: Err http://32.repository.backtrack-linux.org revolution/non-free Packages Unable to connect to 32.repository.backtrack-linux.org:http: Err http://32.repository.backtrack-linux.org revolution/testing Packages Unable to connect to 32.repository.backtrack-linux.org:http: Err http://source.repository.backtrack-linux.org revolution Release.gpg Could not connect to source.repository.backtrack-linux.org:80 (37.221.173.214). - connect (110: Connection timed out) Err http://source.repository.backtrack-linux.org/ revolution/main Translation-en_US Unable to connect to source.repository.backtrack-linux.org:http: Err http://source.repository.backtrack-linux.org/ revolution/microverse Translation-en_US Unable to connect to source.repository.backtrack-linux.org:http: Err http://source.repository.backtrack-linux.org/ revolution/non-free Translation-en_US Unable to connect to source.repository.backtrack-linux.org:http: Err http://source.repository.backtrack-linux.org/ revolution/testing Translation-en_US Unable to connect to source.repository.backtrack-linux.org:http: Ign http://source.repository.backtrack-linux.org revolution Release Ign http://source.repository.backtrack-linux.org revolution/main Packages Ign http://source.repository.backtrack-linux.org revolution/microverse Packages Ign http://source.repository.backtrack-linux.org revolution/non-free Packages Ign http://source.repository.backtrack-linux.org revolution/testing Packages Ign http://source.repository.backtrack-linux.org revolution/main Packages Ign http://source.repository.backtrack-linux.org revolution/microverse Packages Ign http://source.repository.backtrack-linux.org revolution/non-free Packages Ign http://source.repository.backtrack-linux.org revolution/testing Packages Err http://source.repository.backtrack-linux.org revolution/main Packages Unable to connect to source.repository.backtrack-linux.org:http: Err http://source.repository.backtrack-linux.org revolution/microverse Packages Unable to connect to source.repository.backtrack-linux.org:http: Err http://source.repository.backtrack-linux.org revolution/non-free Packages Unable to connect to source.repository.backtrack-linux.org:http: Err http://source.repository.backtrack-linux.org revolution/testing Packages Unable to connect to source.repository.backtrack-linux.org:http: Fetched 2,772B in 1min 3s (44B/s) W: Failed to fetch http://all.repository.backtrack- \linux.org/dists/revolution/Release.gpg Could not connect to all.repository.backtrack-linux.org:80 (37.221.173.214). - connect (110: Connection timed out) W: Failed to fetch http://all.repository.backtrack-linux.org/dists/revolution/main/i18n/Translation-en_US.bz2 Unable to connect to all.repository.backtrack-linux.org:http: W: Failed to fetch http://all.repository.backtrack-linux.org/dists/revolution/microverse/i18n/Translation-en_US.bz2 Unable to connect to all.repository.backtrack-linux.org:http: W: Failed to fetch http://all.repository.backtrack-linux.org/dists/revolution/non-free/i18n/Translation-en_US.bz2 Unable to connect to all.repository.backtrack-linux.org:http: W: Failed to fetch http://all.repository.backtrack-linux.org/dists/revolution/testing/i18n/Translation-en_US.bz2 Unable to connect to all.repository.backtrack-linux.org:http: W: Failed to fetch http://32.repository.backtrack-linux.org/dists/revolution/Release.gpg Could not connect to 32.repository.backtrack-linux.org:80 (37.221.173.214). - connect (110: Connection timed out) W: Failed to fetch http://32.repository.backtrack-linux.org/dists/revolution/main/i18n/Translation-en_US.bz2 Unable to connect to 32.repository.backtrack-linux.org:http: W: Failed to fetch http://32.repository.backtrack-linux.org/dists/revolution/microverse/i18n/Translation-en_US.bz2 Unable to connect to 32.repository.backtrack-linux.org:http: W: Failed to fetch http://32.repository.backtrack-linux.org/dists/revolution/non-free/i18n/Translation-en_US.bz2 Unable to connect to 32.repository.backtrack-linux.org:http: W: Failed to fetch http://32.repository.backtrack-linux.org/dists/revolution/testing/i18n/Translation-en_US.bz2 Unable to connect to 32.repository.backtrack-linux.org:http: W: Failed to fetch http://source.repository.backtrack-linux.org/dists/revolution/Release.gpg Could not connect to source.repository.backtrack-linux.org:80 (37.221.173.214). - connect (110: Connection timed out) W: Failed to fetch http://source.repository.backtrack-linux.org/dists/revolution/main/i18n/Translation-en_US.bz2 Unable to connect to source.repository.backtrack-linux.org:http: W: Failed to fetch http://source.repository.backtrack-linux.org/dists/revolution/microverse/i18n/Translation-en_US.bz2 Unable to connect to source.repository.backtrack-linux.org:http: W: Failed to fetch http://source.repository.backtrack-linux.org/dists/revolution/non-free/i18n/Translation-en_US.bz2 Unable to connect to source.repository.backtrack-linux.org:http: W: Failed to fetch http://source.repository.backtrack-linux.org/dists/revolution/testing/i18n/Translation-en_US.bz2 Unable to connect to source.repository.backtrack-linux.org:http: W: Failed to fetch http://32.repository.backtrack-linux.org/dists/revolution/main/binary-i386/Packages.gz Unable to connect to 32.repository.backtrack-linux.org:http: W: Failed to fetch http://32.repository.backtrack-linux.org/dists/revolution/microverse/binary-i386/Packages.gz Unable to connect to 32.repository.backtrack-linux.org:http: W: Failed to fetch http://32.repository.backtrack-linux.org/dists/revolution/non-free/binary-i386/Packages.gz Unable to connect to 32.repository.backtrack-linux.org:http: W: Failed to fetch http://all.repository.backtrack-linux.org/dists/revolution/main/binary-i386/Packages.gz Unable to connect to all.repository.backtrack-linux.org:http: W: Failed to fetch http://all.repository.backtrack-linux.org/dists/revolution/microverse/binary-i386/Packages.gz Unable to connect to all.repository.backtrack-linux.org:http: W: Failed to fetch http://all.repository.backtrack-linux.org/dists/revolution/non-free/binary-i386/Packages.gz Unable to connect to all.repository.backtrack-linux.org:http: W: Failed to fetch http://all.repository.backtrack-linux.org/dists/revolution/testing/binary-i386/Packages.gz Unable to connect to all.repository.backtrack-linux.org:http: W: Failed to fetch http://32.repository.backtrack-linux.org/dists/revolution/testing/binary-i386/Packages.gz Unable to connect to 32.repository.backtrack-linux.org:http: W: Failed to fetch http://source.repository.backtrack-linux.org/dists/revolution/main/binary-i386/Packages.gz Unable to connect to source.repository.backtrack-linux.org:http: W: Failed to fetch http://source.repository.backtrack-linux.org/dists/revolution/microverse/binary-i386/Packages.gz Unable to connect to source.repository.backtrack-linux.org:http: W: Failed to fetch http://source.repository.backtrack-linux.org/dists/revolution/non-free/binary-i386/Packages.gz Unable to connect to source.repository.backtrack-linux.org:http: W: Failed to fetch http://source.repository.backtrack-linux.org/dists/revolution/testing/binary-i386/Packages.gz Unable to connect to source.repository.backtrack-linux.org:http: E: Some index files failed to download, they have been ignored, or old ones used instead. I Don't know how to get out of this ! I want to install RPM and YUM package on my backtrack ! I also searched over internet for answer . in backtrack forums or any other sites or weblogs i could'nt find a good answer ! can anyone help ??

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  • extreme slowness with a remote database in Drupal

    - by ceejayoz
    We're attempting to scale our Drupal installations up and have decided on some dedicated MySQL boxes. Unfortunately, we're running into extreme slowness when we attempt to use the remote DB - page load times go from ~200 milliseconds to 5-10 seconds. Latency between the servers is minimal - a tenth or two of a millisecond. PING 10.37.66.175 (10.37.66.175) 56(84) bytes of data. 64 bytes from 10.37.66.175: icmp_seq=1 ttl=64 time=0.145 ms 64 bytes from 10.37.66.175: icmp_seq=2 ttl=64 time=0.157 ms 64 bytes from 10.37.66.175: icmp_seq=3 ttl=64 time=0.157 ms 64 bytes from 10.37.66.175: icmp_seq=4 ttl=64 time=0.144 ms 64 bytes from 10.37.66.175: icmp_seq=5 ttl=64 time=0.121 ms 64 bytes from 10.37.66.175: icmp_seq=6 ttl=64 time=0.122 ms 64 bytes from 10.37.66.175: icmp_seq=7 ttl=64 time=0.163 ms 64 bytes from 10.37.66.175: icmp_seq=8 ttl=64 time=0.115 ms 64 bytes from 10.37.66.175: icmp_seq=9 ttl=64 time=0.484 ms 64 bytes from 10.37.66.175: icmp_seq=10 ttl=64 time=0.156 ms --- 10.37.66.175 ping statistics --- 10 packets transmitted, 10 received, 0% packet loss, time 8998ms rtt min/avg/max/mdev = 0.115/0.176/0.484/0.104 ms Drupal's devel.module timers show the database queries aren't running any slower on the remote DB - about 150 microseconds whether it's the local or the remote server. Profiling with XHProf shows PHP execution times that aren't out of whack, either. Number of queries doesn't seem to make a difference - we seem the same 5-10 second delay whether a page has 12 queries or 250. Any suggestions about where I should start troubleshooting here? I'm quite confused.

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  • postgreSQL vs Cassandra vs MongoDB vs Voldemart ?

    - by ramonrails
    Which database to decide upon? Any comparisions? Existing: postgresql Issues Not easily scalable horizontal. Needs sharding etc Clustering does not solve the data growth problem Looking for: Any database that is easily horizontally scalable Cassandra (Twitter uses that?) MongoDB (rapidly gaining popularity) Voldemart Other? Why? Data growing with snowball effect existing postgresql locks table etc for vaccuum tasks periodically Archiving data is tideous currently Human interaction involved in existing archive, vaccuum, ... process periodically Need a 'set it. forget it. just add another server when data grows more.' type of solution

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  • High apache load but little traffic logged

    - by nrambeck
    I recently installed Varnish to sit in front of Apache on a dedicated server running a single site. It appears to be working well, but the load on Apache is still very high. What doesn't make sense is that the Apache access log shows almost no traffic getting past Varnish. When I tail the apache log I see about 1-3 hits per second come through. Here is what the load on Apache looks like : USER PID %CPU %MEM VSZ RSS TTY STAT START TIME COMMAND apache 13834 8.1 1.0 107716 34164 ? S 08:24 0:02 /usr/sbin/httpd apache 13835 8.1 1.0 107716 33856 ? S 08:24 0:02 /usr/sbin/httpd apache 11483 7.9 0.9 105916 30788 ? S 08:23 0:06 /usr/sbin/httpd apache 12255 7.5 1.0 107476 33312 ? S 08:24 0:04 /usr/sbin/httpd apache 9340 7.2 1.1 107732 34916 ? R 08:23 0:09 /usr/sbin/httpd apache 12029 6.8 0.9 106908 30416 ? S 08:24 0:04 /usr/sbin/httpd apache 11577 6.7 1.0 107192 34180 ? S 08:24 0:05 /usr/sbin/httpd apache 11486 6.6 1.0 106176 33112 ? S 08:23 0:05 /usr/sbin/httpd apache 11796 6.4 1.0 106936 31916 ? S 08:24 0:04 /usr/sbin/httpd apache 13815 6.3 1.0 107988 34464 ? S 08:24 0:02 /usr/sbin/httpd apache 18089 6.3 1.3 107444 43212 ? S 08:11 0:52 /usr/sbin/httpd apache 11797 5.9 1.0 107716 34580 ? S 08:24 0:04 /usr/sbin/httpd apache 7655 5.9 0.0 0 0 ? Z 08:22 0:09 [httpd] <defunct> mysql 8033 5.9 6.2 318240 199512 ? Sl May14 352:34 /usr/libexec/mysqld --basedir=/usr --datadir=/var/lib/mysql --user=mysql --pid-file=/va apache 11488 5.8 0.9 106924 31632 ? S 08:23 0:04 /usr/sbin/httpd apache 9375 5.7 1.1 106956 35552 ? S 08:23 0:07 /usr/sbin/httpd apache 3551 5.6 1.1 106956 36140 ? S 08:20 0:14 /usr/sbin/httpd apache 7657 5.6 1.0 106968 32472 ? S 08:22 0:09 /usr/sbin/httpd apache 11433 5.6 1.0 107716 34396 ? S 08:23 0:04 /usr/sbin/httpd apache 5505 5.5 1.1 106944 34924 ? S 08:21 0:12 /usr/sbin/httpd apache 7172 5.3 1.1 106972 35368 ? S 08:22 0:09 /usr/sbin/httpd apache 10088 5.2 0.9 106160 31240 ? S 08:23 0:04 /usr/sbin/httpd apache 7656 5.1 1.0 106436 34388 ? S 08:22 0:08 /usr/sbin/httpd apache 3468 5.0 1.1 107716 35968 ? S 08:20 0:13 /usr/sbin/httpd apache 14242 4.8 1.0 107728 33032 ? S 08:25 0:00 /usr/sbin/httpd apache 3578 4.8 1.1 107988 35964 ? S 08:20 0:12 /usr/sbin/httpd apache 28192 4.8 1.2 106944 38060 ? S 08:17 0:23 /usr/sbin/httpd apache 3277 4.6 1.1 106956 35688 ? S 08:20 0:13 /usr/sbin/httpd apache 15434 3.7 0.7 106908 24684 ? S 08:25 0:00 /usr/sbin/httpd There is a default apache log and then one other VirtualHost log setup. I'm concerned that Apache is handling some kind of traffic that is not being logged. Is that possible? And is there anything I can do to capture that traffic?

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  • Best available technology for layered disk cache in linux

    - by SpliFF
    I've just bought a 6-core Phenom with 16G of RAM. I use it primarily for compiling and video encoding (and occassional web/db). I'm finding all activities get disk-bound and I just can't keep all 6 cores fed. I'm buying an SSD raid to sit between the HDD and tmpfs. I want to setup a "layered" filesystem where reads are cached on tmpfs but writes safely go through to the SSD. I want files (or blocks) that haven't been read lately on the SSD to then be written back to a HDD using a compressed FS or block layer. So basically reads: - Check tmpfs - Check SSD - Check HD And writes: - Straight to SSD (for safety), then tmpfs (for speed) And periodically, or when space gets low: - Move least frequently accessed files down one layer. I've seen a few projects of interest. CacheFS, cachefsd, bcache seem pretty close but I'm having trouble determining which are practical. bcache seems a little risky (early adoption), cachefs seems tied to specific network filesystems. There are "union" projects unionfs and aufs that let you mount filesystems over each other (USB device over a DVD usually) but both are distributed as a patch and I get the impression this sort of "transparent" mounting was going to become a kernel feature rather than a FS. I know the kernel has a built-in disk cache but it doesn't seem to work well with compiling. I see a 20x speed improvement when I move my source files to tmpfs. I think it's because the standard buffers are dedicated to a specific process and compiling creates and destroys thousands of processes during a build (just guessing there). It looks like I really want those files precached. I've read tmpfs can use virtual memory. In that case is it practical to create a giant tmpfs with swap on the SSD? I don't need to boot off the resulting layered filesystem. I can load grub, kernel and initrd from elsewhere if needed. So that's the background. The question has several components I guess: Recommended FS and/or block layer for the SSD and compressed HDD. Recommended mkfs parameters (block size, options etc...) Recommended cache/mount technology to bind the layers transparently Required mount parameters Required kernel options / patches, etc..

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  • When tab groups are loaded, Firefox becomes unresponsible for minutes (Unresponsive script)

    - by unor
    I have several tab groups (~ 20) in Firefox. I can start the browser without any problems. However, as soon as I … click at the "Group tabs" icon in the toolbar, or right-click on a tab and hover over "Move to tab group", … Firefox becomes unresponsible/freezes for a rather long time (more than 2 minutes). It seems to load all tab groups (it doesn't load all the pages! I deactivated this in the settings). While this is happening, I get several "Unresponsive script" warnings, like: Script: chrome://global/content/bindings/tabbox.xml:0 (most of the time) Script: chrome://global/content/bindings/tabbox.xml:418 Script: chrome://browser/content/tabview.js:400 Script: chrome://browser/content/tabview.js:522 Script: resource://modules/sessionstore/SessionStore.jsm:3578 Script: resource:///components/PageThumbsProtocol.js:79 (rare) Script: resource://gre/modules/XPCOMUtils.jsm:323 (rare) (probably also other warnings, didn't record them yet, though) On all of these I click "Continue". After ~ 2-3 minutes and 3-5 warnings, I can use Firefox again. Now I can switch tab groups without any problems. Why is this happening? How can I prevent the long loading time? Is there maybe a about:config setting I could try? I started Firefox in Safe Mode (= without any add-ons): the problem still exists.

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  • SQL 2008 Database tuning advisor won’t start

    - by Andrew Hancox
    For some reason I can't get DTA to connect to my development machine. It connects to a remote DB just fine but when I point it to my dev machine I get an error saying: Failed to initialize MSDB database for tuning (exit code: -1073741819). I'm pretty sure it's not a permissions issue since I've used profiler to capture what it's doing and all of the commands it's run so far look fine and are being run under my account which is associated with the sysadmin role, when I run them in sql management studio they go through fine. I'm pretty convinced that the problem is related to creating the objects in MSDB that are used by DTA but I tried creating these manually (I found scripts on the web) and it just seems to push the problem along the line slightly. I'm going out of my mind - have even tried reinstalling SQL but that's not fixed it. I'm using SQL 2008 with SP1 (10.0.2531) on windows server 2008 (patched up to date). SAVE ME!!!!!

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  • PostgreSQL lots of writes

    - by strife911
    Hi, I am using postgreSQL for a scientific application (unsupervised clustering). The python program is multi-threaded so that each thread manages its own postmaster process (one per core). Hence, their is a lot of concurrency. Each thread-process loop infinitely though two SQL queries. The first is for reading, the second is for writing. The read operation considers 500 time the amount of rows the write operation considers. Here is the output of dstat: ----total-cpu-usage---- ------memory-usage----- -dsk/total- --paging-- --io/total- usr sys idl wai hiq siq| used buff cach free| read writ| in out | read writ 4 0 32 64 0 0|3599M 63M 57G 1893M|1524k 16M| 0 0 | 98 2046 1 0 35 64 0 0|3599M 63M 57G 1892M|1204k 17M| 0 0 | 68 2062 2 0 32 66 0 0|3599M 63M 57G 1890M|1132k 17M| 0 0 | 62 2033 2 1 32 65 0 0|3599M 63M 57G 1904M|1236k 18M| 0 0 | 80 1994 2 0 31 67 0 0|3599M 63M 57G 1903M|1312k 16M| 0 0 | 70 1900 2 0 37 60 0 0|3599M 63M 57G 1899M|1116k 15M| 0 0 | 71 1594 2 1 37 60 0 0|3599M 63M 57G 1898M| 448k 17M| 0 0 | 39 2001 2 0 25 72 0 0|3599M 63M 57G 1896M|1192k 17M| 0 0 | 78 1946 1 0 40 58 0 0|3599M 63M 57G 1895M| 432k 15M| 0 0 | 38 1937 I am pretty sure I could write more often than that for I have seen it write up to 110-140M on dstat. How can I optimize this process?

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  • virtual directory make file copy operation extremely slow on UNC Path (IIS 7.5 bug?)

    - by user144737
    When i create a website/virtual directory pointing to UNC path, its make our file copy extremely slow on the UNC path. 6 seconds for file copy (~13 M) on the UNC path without any virtual directory/website pointing to it. over 1 mins. for file copy (same files ~13M) on the same UNC path with virtual directory/website pointing to it. All file copy operation run on web server side. Our setting as below: Web server - Windows Server standard R2 2008 / IIS 7.5 File server - Windows Server standard 2003 I have tested this case on 3 servers (Windows Server standard R2 2008 / IIS 7.5) and got same result. I also tested this case on 2 windows 2003 / IIS 6, it won't slow down the file copy. Is it IIS 7.5 bug? any patch/hotfix to solve this case? Thank you. Gordon

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  • Too much memory consumed during TFS automated build

    - by Bernard Chen
    We're running TFS 2010 Standard Edition, and we've set up an automated build to run whenever someone checks in code. We run through all of the automated tests (built with MSTest) as part of the build. We've configured the build to run the tests as a 64-bit process, but the QTAgent.exe that runs the tests grows in memory while the tests are running. It is currently reaching 8GB for the ~650 tests we have, and the process has slowed significantly when we went from 450 tests to 650 tests. When we run all of the tests in the local development environment, memory seems to be freed at least with each TestClass and never exceeds a certain level. The process of running all tests has not increased significantly in the local development environment. Is there a way to configure the build service to free up memory with each Test or each TestClass? With the way things are currently running, the build process gets very slow when we start to run out of memory on the machine. Edit: I found the MSTest invocation in the build log and ran it manually and saw the same behavior of runaway memory. I removed the /publish, /publishbuild, /teamproject, /platform, and /flavor parameters from the invocation of MSTest, in case the test runner was holding onto results until the end, but the behavior didn't change. I ran the same command line on a dev box, separate from the build server, and the memory freed up frequently. It seems there must be something wrong/different about the build server that is causing it to behave different, but I'm stumped where to look. I've looked at qtagent.exe.config, mstest.exe.config, versions of both executables. What else might affect this?

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  • Why are 32-bit application pools more efficient in IIS? [closed]

    - by mhenry1384
    I've been running load tests with two different ASP.NET web applications in IIS. The tests are run with 5,10,25, and 250 user agents. Tested on a box with 8 GB RAM, Windows 7 Ultimate x64. The same box running both IIS and the load test project. I did many runs, and the data is very consistent. For every load, I see a lower "Avg. Page Time (sec)" and a lower "Avg. Response Time (sec)" if I have "Enable 32-bit Applications" set to True in the Application Pools. The difference gets more pronounced the higher the load. At very high loads, the web applications start to throw errors (503) if the application pools are 64-bit, but they can can keep up if set to 32-bit. Why are 32-bit app pools so much more efficient? Why isn't the default for application pools 32-bit?

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  • System Monitoring service - Hosted

    - by sevitzdotcom
    I'm looking for a system monitoring service, a bit like New Relic, but for more the system itself than the ruby side of things. i.e. something like Zabbix, but hosted like New Relic. I wont something I can just drop an 'agent' on the servers, and then do all the config and monitoring and notifications on a nice slick 3rd party system. So essential Zabbix Meats New Relic meets Pingdom. Any ideas?

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  • Perfmon - Redirector current command 0 result

    - by Dave
    I'd like to monitor how many SMB connections there are at any given time for my 2008R2 file server, but when I add Redirector/Current Commands in perfmon, I get 0 results. This KB from Microsoft isn't exactly helpful either: http://support.microsoft.com/kb/2523382 It mearly confirms there is an issue, but doesn't provide a work around. How would I go about getting the current number of SMB connections? Thanks for your help in advance.

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  • GlusterFS vs Ceph, which is better for production use for the moment?

    - by Mickey Shine
    I am evaluating GlusterFS and Ceph, seems Gluster is FUSE based which means it may be not as fast as Ceph. But looks like Gluster got a very friendly control panel and is ease to use. Ceph was merged into linux kernel a few days ago and this indicates that it has much more potential energy and may be a good choice in the future. I am wondering which(even out of the two?) is a better choice for production use? It would be nice if you could share your practical experiences

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  • Running perfmon continuously with periodic reports

    - by Sal
    I have a question very similar to this one, but I want to continuously run perfmon, during reboots and throughout the day. Further, I'd like to generate a perfmon report every 10 mins or so. The original question tells me how to run perfmon when the server is restarted, but I don't know how to make perfmon continuously run while throwing periodic files. I've tried setting it as a scheduled task that needs to be done every 10 mins, but this is too sloppy, and when the scheduled task kicks another instance, the current perfmon report writer crashes, and I get a garbage report. I've also tried writing a sloppy batch script that would fire off the task at scheduled intervals, but this is the same problem as the scheduled task. I'm sure I'm just missing something silly, but I don't see it. Ideas? (If it helps, I'm running Windows 7 locally, and I'm trying to set up the processes for boxes running Windows 2008.)

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  • What type of Multimeter is safe to use on computers?

    - by Ssvarc
    In "Upgrading and Repairing PC's - 18th edition" by Scott Mueller on pg. 1278 he discusses multimeters. "You should only use a DMM (digital multimeter) instead of the older needle-type multimeters because the older meters work by injecting 9V into the circuit when measuring resistance, which damages most computer circuits. A DMM uses a much smaller voltage (usually 1.5V) when making resistance measurements, which is safe for electronic equipment." Most DMM's that I've looked at have 9V batteries. Are they internally stepping down the voltage used when making these measurements? Wouldn't the concern of injecting 9V be true when measuring continuity as well? A little off topic, there is a fascinating way to test for laptop screen inverter failure, (http://www.fonerbooks.com/test.htm), is anyone aware of a safe DMM that is capable of this as well?

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