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  • migrating Solaris to RH: network latency issue, tcp window size & other tcp parameters

    - by Bastien
    Hello I have a client/server app (Java) that I'm migrating from Solaris to RH Linux. since I started running it in RH, I noticed some issues related to latency. I managed to isolate the problem that looks like this: client sends 5 messages (32 bytes each) in a row (same application timestamp) to the server. server echos messages. client receives replies and prints round trip time for each msg. in Solaris, all is well: I get ALL 5 replies at the same time, roughly 80ms after having sent original messages (client & server are several thousands miles away from each other: my ping RTT is 80ms, all normal). in RH, first 3 messages are echoed normally (they arrive 80ms after they've been sent), however the following 2 arrive 80ms later (so total 160ms RTT). the pattern is always the same. clearly looked like a TCP problem. on my solaris box, I had previously configured the tcp stack with 2 specific options: disable nagle algorithm globally set tcp_deferred_acks_max to 0 on RH, it's not possible to disable nagle globally, but I disabled it on all of my apps' sockets (TCP_NODELAY). so I started playing with tcpdump (on the server machine), and compared both outputs: SOLARIS: 22 2.085645 client server TCP 56150 > 6006 [PSH, ACK] Seq=111 Ack=106 Win=66672 Len=22 "MSG_1 RCV" 23 2.085680 server client TCP 6006 > 56150 [ACK] Seq=106 Ack=133 Win=50400 Len=0 24 2.085908 client server TCP 56150 > 6006 [PSH, ACK] Seq=133 Ack=106 Win=66672 Len=22 "MSG_2 RCV" 25 2.085925 server client TCP 6006 > 56150 [ACK] Seq=106 Ack=155 Win=50400 Len=0 26 2.086175 client server TCP 56150 > 6006 [PSH, ACK] Seq=155 Ack=106 Win=66672 Len=22 "MSG_3 RCV" 27 2.086192 server client TCP 6006 > 56150 [ACK] Seq=106 Ack=177 Win=50400 Len=0 28 2.086243 server client TCP 6006 > 56150 [PSH, ACK] Seq=106 Ack=177 Win=50400 Len=21 "MSG_1 ECHO" 29 2.086440 client server TCP 56150 > 6006 [PSH, ACK] Seq=177 Ack=106 Win=66672 Len=22 "MSG_4 RCV" 30 2.086454 server client TCP 6006 > 56150 [ACK] Seq=127 Ack=199 Win=50400 Len=0 31 2.086659 server client TCP 6006 > 56150 [PSH, ACK] Seq=127 Ack=199 Win=50400 Len=21 "MSG_2 ECHO" 32 2.086708 client server TCP 56150 > 6006 [PSH, ACK] Seq=199 Ack=106 Win=66672 Len=22 "MSG_5 RCV" 33 2.086721 server client TCP 6006 > 56150 [ACK] Seq=148 Ack=221 Win=50400 Len=0 34 2.086947 server client TCP 6006 > 56150 [PSH, ACK] Seq=148 Ack=221 Win=50400 Len=21 "MSG_3 ECHO" 35 2.087196 server client TCP 6006 > 56150 [PSH, ACK] Seq=169 Ack=221 Win=50400 Len=21 "MSG_4 ECHO" 36 2.087500 server client TCP 6006 > 56150 [PSH, ACK] Seq=190 Ack=221 Win=50400 Len=21 "MSG_5 ECHO" 37 2.165390 client server TCP 56150 > 6006 [ACK] Seq=221 Ack=148 Win=66632 Len=0 38 2.166314 client server TCP 56150 > 6006 [ACK] Seq=221 Ack=190 Win=66588 Len=0 39 2.364135 client server TCP 56150 > 6006 [ACK] Seq=221 Ack=211 Win=66568 Len=0 REDHAT: 17 2.081163 client server TCP 55879 > 6006 [PSH, ACK] Seq=111 Ack=106 Win=66672 Len=22 "MSG_1 RCV" 18 2.081178 server client TCP 6006 > 55879 [ACK] Seq=106 Ack=133 Win=5888 Len=0 19 2.081297 server client TCP 6006 > 55879 [PSH, ACK] Seq=106 Ack=133 Win=5888 Len=21 "MSG_1 ECHO" 20 2.081711 client server TCP 55879 > 6006 [PSH, ACK] Seq=133 Ack=106 Win=66672 Len=22 "MSG_2 RCV" 21 2.081761 client server TCP 55879 > 6006 [PSH, ACK] Seq=155 Ack=106 Win=66672 Len=22 "MSG_3 RCV" 22 2.081846 server client TCP 6006 > 55879 [PSH, ACK] Seq=127 Ack=177 Win=5888 Len=21 "MSG_2 ECHO" 23 2.081995 server client TCP 6006 > 55879 [PSH, ACK] Seq=148 Ack=177 Win=5888 Len=21 "MSG_3 ECHO" 24 2.082011 client server TCP 55879 > 6006 [PSH, ACK] Seq=177 Ack=106 Win=66672 Len=22 "MSG_4 RCV" 25 2.082362 client server TCP 55879 > 6006 [PSH, ACK] Seq=199 Ack=106 Win=66672 Len=22 "MSG_5 RCV" 26 2.082377 server client TCP 6006 > 55879 [ACK] Seq=169 Ack=221 Win=5888 Len=0 27 2.171003 client server TCP 55879 > 6006 [ACK] Seq=221 Ack=148 Win=66632 Len=0 28 2.171019 server client TCP 6006 > 55879 [PSH, ACK] Seq=169 Ack=221 Win=5888 Len=42 "MSG_4 ECHO + MSG_5 ECHO" 29 2.257498 client server TCP 55879 > 6006 [ACK] Seq=221 Ack=211 Win=66568 Len=0 so, I got confirmation things are not working correctly for RH: packet 28 is sent TOO LATE, it looks like the server is waiting for packet 27's ACK before doing anything. seems to me it's the most likely reason... then I realized that the "Win" parameters are different on Solaris & RH dumps: 50400 on Solaris, only 5888 on RH. that's another hint... I read the doc about the slide window & buffer window, and played around with the rcvBuffer & sendBuffer in java on my sockets, but never managed to change this 5888 value to anything else (I checked each time directly with tcpdump). does anybody know how to do this ? I'm having a hard time getting definitive information, as in some cases there's "auto-negotiation" that I might need to bypass, etc... I eventually managed to get only partially rid of my initial problem by setting the "tcp_slow_start_after_idle" parameter to 0 on RH, but it did not change the "win" parameter at all. the same problem was there for the first 4 groups of 5 messages, with TCP retransmission & TCP Dup ACK in tcpdump, then the problem disappeared altogether for all following groups of 5 messages. It doesn't seem like a very clean and/or generic solution to me. I'd really like to reproduce the exact same conditions under both OSes. I'll keep researching, but any help from TCP gurus would be greatly appreciated ! thanks !

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  • HP ProLiant Smart Array "lock up" code 0x11

    - by ewwhite
    I've a ProLiant DL580 G7 server that experienced a storage subsystem failure during production. The system appeared available and responded to pings, but all I/O access stalled (the system load must have been 100+). The ASR did not trigger at the specified watchdog timeout. I had to force a reboot from the ILO. During POST, I received the following error: A controller failure event occurred prior to this power-up. (Previous lock up code = 0x11) I haven't pulled the ADU report yet, but I'm curious as to what this error actually means. I was not responsible for the the installation, but can see that the firmware is very old. But if there's anything else I should know about the error, I'd like to know for the post-mortem report. edit - I should add that the server had 95 days of uptime prior to the lock up.

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  • java.lang.OutOfMemoryError: unable to create new native thread

    - by Brad
    I consistently get this exception when trying to run my Junit tests on my mac: java.lang.OutOfMemoryError: unable to create new native thread at java.lang.Thread.start0(Native Method) at java.lang.Thread.start(Thread.java:658) at java.util.concurrent.ThreadPoolExecutor.addIfUnderMaximumPoolSize(ThreadPoolExecutor.java:727) at java.util.concurrent.ThreadPoolExecutor.execute(ThreadPoolExecutor.java:657) at java.util.concurrent.AbstractExecutorService.submit(AbstractExecutorService.java:92) at com.google.appengine.tools.development.ApiProxyLocalImpl$PrivilegedApiAction.run(ApiProxyLocalImpl.java:197) at com.google.appengine.tools.development.ApiProxyLocalImpl$PrivilegedApiAction.run(ApiProxyLocalImpl.java:184) at java.security.AccessController.doPrivileged(Native Method) at com.google.appengine.tools.development.ApiProxyLocalImpl.doAsyncCall(ApiProxyLocalImpl.java:172) at com.google.appengine.tools.development.ApiProxyLocalImpl.makeAsyncCall(ApiProxyLocalImpl.java:138) The same set of unit tests pass perfectly fine on ubuntu and windows. Some information about my system resources on the mac: $ ulimit -a core file size (blocks, -c) 0 data seg size (kbytes, -d) unlimited file size (blocks, -f) unlimited max locked memory (kbytes, -l) unlimited max memory size (kbytes, -m) unlimited open files (-n) 1024 pipe size (512 bytes, -p) 1 stack size (kbytes, -s) 8192 cpu time (seconds, -t) unlimited max user processes (-u) 266 virtual memory (kbytes, -v) unlimited $ java -version java version "1.6.0_24" Java(TM) SE Runtime Environment (build 1.6.0_24-b07-334-10M3326) Java HotSpot(TM) 64-Bit Server VM (build 19.1-b02-334, mixed mode) The reason I dont think this is an application issue is because the same tests pass in different environments. I have tried setting heap to 1024m, 512m and setting the stack to 64k and 128k (and each of these combinations) with no luck. My open files was originally 256 and I have bumped this to 1024. I have been googling around for a bit and all posts say to decrease heap size and increase stack size but that doesnt seem to help. Anyone have anymore ideas? EDIT: Here are is some environment information on my ubuntu box: $ ulimit -a core file size (blocks, -c) 0 data seg size (kbytes, -d) unlimited scheduling priority (-e) 20 file size (blocks, -f) unlimited pending signals (-i) 16382 max locked memory (kbytes, -l) 64 max memory size (kbytes, -m) unlimited open files (-n) 1024 pipe size (512 bytes, -p) 8 POSIX message queues (bytes, -q) 819200 real-time priority (-r) 0 stack size (kbytes, -s) 8192 cpu time (seconds, -t) unlimited max user processes (-u) unlimited virtual memory (kbytes, -v) unlimited file locks (-x) unlimited $ java -version java version "1.6.0_24" Java(TM) SE Runtime Environment (build 1.6.0_24-b07) Java HotSpot(TM) 64-Bit Server VM (build 19.1-b02, mixed mode)

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  • How to generate Thumbnails with phpThumb and save it into a file?

    - by CuSS
    Hi all, i wan't to know how to generate thumbnails with phpThumb Class, with an array with file paths already. And then Save the result of each image on other path but with the same name. Thank you all ;) EDIT: I have my code something like this: echo "A iniciar gerador de miniaturas para a área de cliente: \n"; include $wincli['files']['phpThumbClass']; $files = file_list($wincli['dirs']['logos']); $phpThumb = new phpThumb(); foreach( $files as $file ) { echo " # A converter o ficheiro '".basename($file)."' : "; if(is_file($file)){ $phpThumb->setSourceFilename($file); $phpThumb->setParameter('w', 880); $phpThumb->setParameter('h', 241); $phpThumb->setParameter('q', 90); $phpThumb->setParameter('zc', 1); $outputFilename = $wincli['dirs']['logosthumbs'].$file; if($phpThumb->GenerateThumbnail()){ if($phpThumb->RenderToFile($outputFilename)){ echo "OK \n"; }else{ echo "Falhou (Ao guardar no ficheiro)\n"; } }else{ echo "Falhou (Ao gerar miniatura)\n"; } }else{ echo "Falhou (Ficheiro inexistente)\n"; } }

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  • Sorting an array of Doubles with NaN in it

    - by Agent Worm
    This is more of a 'Can you explain this' type of question than it is anything else. I came across a problem at work where we were using NaN values in a table, but when the table was sorted, it came out in a very strange, strange manner. I figured NaN was mucking up something so I wrote up a test application to see if this is true. This is what I did. static void Main(string[] args) { double[] someArray = { 4.0, 2.0, double.NaN, 1.0, 5.0, 3.0, double.NaN, 10.0, 9.0, 8.0 }; foreach (double db in someArray) { Console.WriteLine(db); } Array.Sort(someArray); Console.WriteLine("\n\n"); foreach (double db in someArray) { Console.WriteLine(db); } Console.ReadLine(); } Which gave the result: Before: 4,2,NaN,1,5,3,NaN,10,9,8 After: 1,4,NaN,2,3,5,8,9,10,NaN So yes, the NaN some how made the sorted array to be sorted in a strange way. To quote Fry; "Why is those things?"

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  • "Mem Usage" higher than "VM Size" in WinXP Task Manager

    - by Frederick
    In my Windows XP Task Manager, some processes display a higher value in the Mem Usage column than the VMSize. My Firefox instance, for example shows 111544 K as mem usage and 100576 K as VMSize. According to the help file of Task Manager Mem Usage is the working set of the process and VMSize is the committed memory in the Virtual address space. My question is, if the number of committed pages for a process is A and the number of pages in physical memory for the same process is B, shouldn't it always be B = A? Isn't the number of pages in physical memory per process a subset of the committed pages? Or is this something to do with sharing of memory among processes? Please explain. (Perhaps my definition of 'Working Set' is off the mark). Thanks.

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  • CSS and Page Size and Horizontal Scrollbar

    - by Steve
    When I added some CSS stuff to my page, the page got wider and and horizontal appeared even the content is very minimal and does not require to scroll. How can I remove it. I used the following to remove it but it appears as a hack and I am just playing around with CSS, so is there a proper way to do this

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  • Hibernate bit array to entity mapping

    - by teabot
    I am trying to map a normalized Java model to a legacy database schema using Hibernate 3.5. One particular table encodes a foreign keys in a one-to-many relationship as a bit array column. Consider tables 'person' and 'clubs' that describes people's affiliations to clubs: person .----.------. club: .----.---------.---------------------------. | id | name | | id | name | members | binary(members) | |----+------| |----+---------|---------+-----------------| | 1 | Bob | | 10 | Cricket | 0 | 000 | | 2 | Joe | | 11 | Tennis | 5 | 101 | | 3 | Sue | | 12 | Cooking | 7 | 111 | '----'------' | 13 | Golf | 3 | 100 | '----'---------'---------'-----------------' So hopefully it is clear that person.id is used as the bit index in the bit array club.members. In this example the members column tells us that: no one is a member of Cricket, Bob/Sue - Tennis, Bob/Sue/Joe - Cooking and Sue - Golf. In my Java domain I'd like to declare this with entities like so: class Person { private int id; private String name; ... } class Club { private Set<Person> members; private int id; private String name; ... } I am assuming that I must use a UserType implementation but have been unable to find any examples where the items described by the user type are references to entities - not literal field values - or composites thereof. Additionally I am aware that I'll have to consider how the person entities are fetched when a club instance is loaded. Can anyone tell me how I can tame this legacy schema with Hibernate?

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  • .net famework 4 total application deployment size

    - by kzen
    After watching in horror as the .net framework 3.5 SP1 bloated to whopping 231 MB I was amazed to see that .NET Framework 4 Full (x86) is only 35 MB and client profile just 29 MB... My question is if .NET Framework 4 is in any way dependent on previous versions of the framework(s) being installed on the client machine or if my users will have to download only 29 (or 35) MB if I develop a Winforms or WPF desktop application in VS 2010 targeting the .NET Framework 4?

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  • obj-c problem setting array with componentsSeperatedByString

    - by Brodie4598
    I have a data source with about 2000 lines that look like the following: 6712,Anaktuvuk Pass Airport,Anaktuvuk Pass,United States,AKP,PAKP,68.1336,-151.743,2103,-9,A What I am interested in is the 6th section of this string so I want to turn it into an array, then i want to check the 6th section [5] for an occurrance of that string "PAKP" Code: NSBundle *bundle = [NSBundle mainBundle]; NSString *airportsPath = [bundle pathForResource:@"airports" ofType:@"dat"]; NSData *data = [NSData dataWithContentsOfFile:airportsPath]; NSString *dataString = [[[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding] autorelease]; NSArray *dataArray = [dataString componentsSeparatedByString:@"\n"]; NSRange locationOfAirport; NSString *workingString = [[NSString alloc]initWithFormat:@""]; NSString *searchedAirport = [[NSString alloc]initWithFormat:@""]; NSString *airportData = [[NSString alloc]initWithFormat:@""]; int d; for (d=0; d < [dataArray count]; d=d+1) { workingString = [dataArray objectAtIndex:d]; testTextBox = workingString; //works correctly NSArray *workingArray = [workingString componentsSeparatedByString:@","]; testTextBox2 = [workingArray objectAtIndex: 0]; //correctly displays the first section "6712" testTextBox3 = [workingArray objectAtIndex:1] //throws exception index beyond bounds locationOfAirport = [[workingArray objectAtIndex:5] rangeOfString:@"PAKP"]; } the problem is that when the workingArray populates, it only populates with a single object (the first component of the string which is "6712". If i have it display the workingString, it correctly displays the entire string, but for some reason, it isn't correctly making the array using the commas. i tried it without using the data file and it worked fine, so the problem comes from how I am importing the data. ideas?

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  • Mysteriously empty $_POST array

    - by Lex
    Hi! I have this question running on StackOverflow.com. But it turns out that it may be an related to a setting on the server, so I wanted to ask you too. Please follow the link to SO, and help me. Thanks a lot!

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  • Find max integer size that a floating point type can handle without loss of precision

    - by Checkers
    Double has range more than a 64-bit integer, but its precision is less dues to its representation (since double is 64-bit as well, it can't fit more actual values). So, when representing larger integers, you start to lose precision in the integer part. #include <boost/cstdint.hpp> #include <limits> template<typename T, typename TFloat> void maxint_to_double() { T i = std::numeric_limits<T>::max(); TFloat d = i; std::cout << std::fixed << i << std::endl << d << std::endl; } int main() { maxint_to_double<int, double>(); maxint_to_double<boost::intmax_t, double>(); maxint_to_double<int, float>(); return 0; } This prints: 2147483647 2147483647.000000 9223372036854775807 9223372036854775800.000000 2147483647 2147483648.000000 Note how max int can fit into a double without loss of precision and boost::intmax_t (64-bit in this case) cannot. float can't even hold an int. Now, the question: is there a way in C++ to check if the entire range of a given integer type can fit into a loating point type without loss of precision? Preferably, it would be a compile-time check that can be used in a static assertion, and would not involve enumerating the constants the compiler should know or can compute.

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  • The post thumbnail size issues

    - by user195257
    Hey Im using this in my wordpress functions.php add_theme_support( 'post-thumbnails' ); set_post_thumbnail_size( 150, 150 ); Im then using it like this <a href="<?php the_permalink(); ?>"><?php the_post_thumbnail(); ?></a> However, the image is displayed <img width="150" height="109" ... The images themselves are 300px x 300px, anyone know whats going on here?

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  • PHP Variable with Array

    - by Crays
    Hi guys, i'm trying to make a "update user's power" page. It is something similar to those you can find in say, invisionfree forums. I need it to generate a list of members with checkbox [done] Add an option for it [done] What i don't know how to do is to update, to say, give all the selected users the selected power. Then i went searching for something and found most of them uses array to do this, but i never found one that actually explains how it works. The example i took (with my own modification) was this: while($row = mysql_fetch_array($result)) { echo '<tr>'.$id[]=$rows['id'].''; echo '<td width="50px" align="center" class="TableFormCell"><input type="checkbox" name="option[]" /></td>'; echo '<td width="170px" align="center" class="TableFormCell">'.$row['uname'].'</td>'; echo '</tr>'; } I'm not sure what exactly $id[]=$rows['id'] does I know after the row, my option[] would become an array of option[1], option[2], option[3] for what power should be given, i've got no problem with that but on how to update the database i'm got no clue... for($i=0;$i<$count;$i++){ $sql1="UPDATE ninos SET power='$power' WHERE id='$option[$i]'"; $result1=mysql_query($sql1); } So Say i have 5 users, Aye, Bee, Cee, Dee, Eee with IDs of 1,2,3,4,5 how can i make it so that my script would run like $sql1="UPDATE ninos SET power = '$power' Where id='1','2','3','4','5'"; Please help, thanks.

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  • Full size image in ImageView

    - by Kilnr
    Hi, I'm trying to draw an image in an ImageView, but i want it to be unscaled, with scrollbars as necessary. How can I accomplish this? Right now I just have a drawable set as the android:src of the ImageView in the XML. This autoscales the image to fit the screen width. I read that this might be because of the compatibility mode (developing for 1.5, testing on 2.1), but then I added <uses-sdk android:minSdkVersion="3" android:targetSdkVersion="4" /> to my manifest, and nothing changed. Any clues?

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  • Getting keyboard size from user info in Swift

    - by user3746428
    I have been trying to add some code to move my view up when the keyboard appears, however I am having issues trying to translate the Objective C examples into Swift. I have made some progress but I am stuck on one particular line. These are the two tutorials/questions I have been following: How to move content of UIViewController upwards as Keypad appears using Swift http://www.ioscreator.com/tutorials/move-view-when-keyboard-appears Here is the code I currently have: override func viewWillAppear(animated: Bool) { NSNotificationCenter.defaultCenter().addObserver(self, selector: "keyboardWillShow:", name: UIKeyboardWillShowNotification, object: nil) NSNotificationCenter.defaultCenter().addObserver(self, selector: "keyboardWillHide:", name: UIKeyboardWillHideNotification, object: nil) } override func viewWillDisappear(animated: Bool) { NSNotificationCenter.defaultCenter().removeObserver(self) } func keyboardWillShow(notification: NSNotification) { var keyboardSize = notification.userInfo(valueForKey(UIKeyboardFrameBeginUserInfoKey)) UIEdgeInsets(top: 0, left: 0, bottom: keyboardSize.height, right: 0) let frame = self.budgetEntryView.frame frame.origin.y = frame.origin.y - keyboardSize self.budgetEntryView.frame = frame } func keyboardWillHide(notification: NSNotification) { // } At the moment I am getting an error on this line: var keyboardSize = notification.userInfo(valueForKey(UIKeyboardFrameBeginUserInfoKey)) If someone could let me know what this line of code should be, I should manage to figure out the rest myself.

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  • Resizing image size using javascript

    - by Jean
    Hello, I am trying to resize the image using javascript, but I am getting errors var y; var y = new Image(); y.src = s; var wd = y.width/600; var ht = y.height/600; if(ht>wd){ var rw=round(wd * (1/ht)); var hw1 = ht * (1/ht); var hw=round(hw1); } else { var rw1 = (wd) * (1/wd); rw=round(rw1); hw=round(ht * (1/wd)); } I am getting errors saying Message: Object expected Line: 27 Char: 2 Code: 0 Where line 27 is rw=round(rw1); Thanks Jean

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  • [javascript - jQuery] creating nested array's on the fly

    - by adardesign
    What i am trying to do is to loop this HTML and get an nested array of this HTML values that i want to grab. This script is just part of a whole function. html <div class="configureData"> <div title="Large"> <a href="yellow" title="true" rel="$55.00" name="sku22828"></a> <a href="green" title="true" rel="$55.00" name="sku224438"></a> <a href="Blue" title="true" rel="$55.00" name="sku22222"></a> </div> <div title="Large"> <a href="yellow" title="true" rel="$55.00" name="sku22828"></a> <a href="green" title="true" rel="$55.00" name="sku224438"></a> <a href="Blue" title="true" rel="$55.00" name="sku22222"></a> </div> <div title="Large"> <a href="yellow" title="true" rel="$55.00" name="sku22828"></a> <a href="green" title="true" rel="$55.00" name="sku224438"></a> <a href="Blue" title="true" rel="$55.00" name="sku22222"></a> </div> </div> javascript // this is part of a script..... parseData:function(dH){ dH.find(".configureData div").each(function(indA, eleA){ colorNSize.tempSizeArray[indA] = [eleA.title,[],[],[],[]] $(eleZ).find("a").each(function(indB, eleB){ colorNSize.tempSizeArray[indA][indB+1] = eleC.title }) }) }, I expect the end array should look like this. [ ["large", ["yellow", "green", "blue"], ["true", "true", "true"], ["$55", "$55","$55"] ], ["Medium", ["yellow", "green", "blue"], ["true", "true", "true"], ["$55", "$55","$55"] ] ] // and so on....

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  • Perl to Ruby conversion (multidimensional arrays)

    - by Alex
    I'm just trying to get my head around a multidimensional array creation from a perl script i'm currently converting to Ruby, I have 0 experience in Perl, as in i opened my first Perl script this morning. Here is the original loop: my $tl = {}; for my $zoom ($zoommin..$zoommax) { my $txmin = lon2tilex($lonmin, $zoom); my $txmax = lon2tilex($lonmax, $zoom); # Note that y=0 is near lat=+85.0511 and y=max is near # lat=-85.0511, so lat2tiley is monotonically decreasing. my $tymin = lat2tiley($latmax, $zoom); my $tymax = lat2tiley($latmin, $zoom); my $ntx = $txmax - $txmin + 1; my $nty = $tymax - $tymin + 1; printf "Schedule %d (%d x %d) tiles for zoom level %d for download ...\n", $ntx*$nty, $ntx, $nty, $zoom unless $opt{quiet}; $tl->{$zoom} = []; for my $tx ($txmin..$txmax) { for my $ty ($tymin..$tymax) { push @{$tl->{$zoom}}, { xyz => [ $tx, $ty, $zoom ] }; } } } and what i have so far in Ruby: tl = [] for zoom in zoommin..zoommax txmin = cm.tiles.xtile(lonmin,zoom) txmax = cm.tiles.xtile(lonmax,zoom) tymin = cm.tiles.ytile(latmax,zoom) tymax = cm.tiles.ytile(latmin,zoom) ntx = txmax - txmin + 1 nty = tymax - tymin + 1 tl[zoom] = [] for tx in txmin..txmax for ty in tymin..tymax tl[zoom] << xyz = [tx,ty,zoom] puts tl end end end The part i'm unsure of is nested right at the root of the loops, push @{$tl->{$zoom}},{ xyz => [ $tx, $ty, $zoom ] }; I'm sure this will be very simple for a seasoned Perl programmer, thanks! `

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  • Preserve Font Size when scaling a Drawing

    - by serhio
    I do the following when drawing: Matrix m = new Matrix() m.Scale(_zoom, _zoom) e.Graphics.Transform = m e.Graphics.DrawLine(...) ' line representation e.Graphics.DrawString(...) ' line text Now, the text became also scaled. Is it possible to avoid it?

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  • Dynamic size canvas with Scroll bars

    - by Pawan
    Hi, I am developing a simple WPF application without any auto layout. The goal is when a user clicks (mouse down) a element (say textBlock) will appear at the location of the mouse click. For this I am using canvas panel embedded in a Grid of 1 row, 1 column and scrollviewer (visible). The issues are: 1. when the application window is resized the scroll viewers do not become active. 2. I want the ability to auto grow the canvas with mouse drag. Something like in MS-Excel when user drags the mouse horizontally/vertically the canvas should grow. I have searched net a lot to figure this out and am unable to get an answer. Any help in this regard would be great. Thanks a bunch in advance. -P

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  • Opera Mobile for Windows + Reported Screen Size

    - by Antony Scott
    I know this isn't a direct programming question, but's it's kinda relevant as I'm trying to get a good testing environment set up before I embark on my latest project. I'm trying to set up Opera Mobile for Windows to allow me to test a new website. The UserAgent I get is a fairly generic one, so my workaround is to tweak my mobile.browser file to have the correct screen width and height of the target device. Is it possible to add to the list of "fake" user agents that Opera Mobile for Windows can pretend to be? It currently supports S60, Android and Windows Mobile.

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