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  • Why is Windows Update trying to install an update I don't need?

    - by Oliver Salzburg
    I have a Windows 7 system that currently has a single update pending: Windows Internet Explorer 9 for Windows 7 for x64-based Systems If I try to install the update, Windows Update will: Create a restore point Fail with the error: Code 9C48 Windows Update encountered an error. The event log for the event reads: Installation Failure: Windows failed to install the following update with error 0x80070643: Windows Internet Explorer 9 for Windows 7 for x64-based Systems. If you search the web for that error, there are many other people with the exact same issue. Sadly, I am unable to apply the proposed solutions to my case, because I just installed this system. There is nothing on it, except Windows 7. I installed the system and ran through the updates. I also did the exact same process with this machine several times over the past few days due to a long-term test we just started. I didn't have any problems with any Windows Update on the previous installation runs and I know I didn't do anything different this time because I followed the installation procedures instructions which are to be used during the test. How did this happen and how do I solve it? Further Investigation So, as I always like to do, I ran the update again while running Process Monitor and dug up further details. WindowsUpdate.log First of all, there is a Windows Update log file located at C:\Windows\WindowsUpdate.log which I didn't know about. But I fail to see any significant entry in it, maybe you're more lucky: 2012-04-10 22:46:58:017 956 728 AU AU received approval from Ux for 1 updates 2012-04-10 22:46:58:017 956 728 AU AU setting pending client directive to 'Progress Ux' 2012-04-10 22:46:58:095 956 728 AU BeginInteractiveInstall invoked for Download 2012-04-10 22:46:58:095 956 728 AU Auto-approving update for download, updateId = {B33ACEC1-3265-4D01-9C37-AC0892E95ED9}.100, ForUx=1, IsOwnerUx=1, HasDeadline=0, IsMinor=0 2012-04-10 22:46:58:095 956 728 AU Auto-approved 1 update(s) for download (for Ux) 2012-04-10 22:46:58:110 956 728 AU UpdateDownloadProperties: 0 download(s) are still in progress. 2012-04-10 22:46:58:110 956 728 AU ############# 2012-04-10 22:46:58:110 956 728 AU ## START ## AU: Download updates 2012-04-10 22:46:58:110 956 728 AU ######### 2012-04-10 22:46:58:110 956 728 AU # Approved updates = 1 2012-04-10 22:46:58:110 956 728 AU AU initiated download, updateId = {B33ACEC1-3265-4D01-9C37-AC0892E95ED9}.100, callId = {35DF928B-B428-4BAC-8C63-55295967EFBB} 2012-04-10 22:46:58:110 956 728 AU Setting AU scheduled install time to 2012-04-11 01:00:00 2012-04-10 22:46:58:110 956 728 AU Successfully wrote event for AU health state:0 2012-04-10 22:46:58:110 956 728 AU Currently showing Progress UX client - so not launching any other client 2012-04-10 22:46:58:110 956 bb8 DnldMgr ************* 2012-04-10 22:46:58:110 956 bb8 DnldMgr ** START ** DnldMgr: Downloading updates [CallerId = AutomaticUpdatesWuApp] 2012-04-10 22:46:58:110 956 bb8 DnldMgr ********* 2012-04-10 22:46:58:110 956 bb8 DnldMgr * Call ID = {35DF928B-B428-4BAC-8C63-55295967EFBB} 2012-04-10 22:46:58:110 956 bb8 DnldMgr * Priority = 3, Interactive = 1, Owner is system = 0, Explicit proxy = 0, Proxy session id = 1, ServiceId = {9482F4B4-E343-43B6-B170-9A65BC822C77} 2012-04-10 22:46:58:110 956 bb8 DnldMgr * Updates to download = 1 2012-04-10 22:46:58:110 956 bb8 Agent * Title = Windows Internet Explorer 9 for Windows 7 for x64-based Systems 2012-04-10 22:46:58:110 956 bb8 Agent * UpdateId = {B33ACEC1-3265-4D01-9C37-AC0892E95ED9}.100 2012-04-10 22:46:58:110 956 bb8 Agent * Bundles 1 updates: 2012-04-10 22:46:58:110 956 bb8 Agent * {6D9A90B7-FAF9-4A47-9EFE-A506264873B3}.100 2012-04-10 22:46:58:110 956 bb8 DnldMgr *********** DnldMgr: New download job [UpdateId = {6D9A90B7-FAF9-4A47-9EFE-A506264873B3}.100] *********** 2012-04-10 22:46:58:110 956 728 AU Successfully wrote event for AU health state:0 2012-04-10 22:46:58:110 956 728 AU # Pending download calls = 1 2012-04-10 22:46:58:110 956 728 AU ## RESUMED ## AU: Download update [UpdateId = {B33ACEC1-3265-4D01-9C37-AC0892E95ED9}, succeeded] 2012-04-10 22:46:58:313 956 bb8 Agent ** END ** Agent: Downloading updates [CallerId = AutomaticUpdatesWuApp] 2012-04-10 22:46:58:313 956 bb8 Agent ************* 2012-04-10 22:46:58:313 956 718 AU ######### 2012-04-10 22:46:58:313 956 718 AU ## END ## AU: Download updates 2012-04-10 22:46:58:313 956 718 AU ############# 2012-04-10 22:46:58:313 956 718 AU Setting AU scheduled install time to 2012-04-11 01:00:00 2012-04-10 22:46:58:313 956 718 AU Successfully wrote event for AU health state:0 2012-04-10 22:46:58:313 956 718 AU Currently showing Progress UX client - so not launching any other client 2012-04-10 22:46:58:313 956 718 AU Successfully wrote event for AU health state:0 2012-04-10 22:46:58:313 956 aac AU Getting featured update notifications. fIncludeDismissed = true 2012-04-10 22:46:58:313 956 aac AU No featured updates available. 2012-04-10 22:47:00:107 956 aac AU BeginInteractiveInstall invoked for Install 2012-04-10 22:47:00:107 956 aac AU Auto-approving update for install, updateId = {B33ACEC1-3265-4D01-9C37-AC0892E95ED9}.100, ForUx=1, IsOwnerUx=1, HasDeadline=0, IsMinor=0 2012-04-10 22:47:00:107 956 aac AU Auto-approved 1 update(s) for install (for Ux), installType=1 2012-04-10 22:47:00:107 956 aac AU ############# 2012-04-10 22:47:00:107 956 aac AU ## START ## AU: Install updates 2012-04-10 22:47:00:107 956 aac AU ######### 2012-04-10 22:47:00:107 956 aac AU # Initiating manual install 2012-04-10 22:47:00:107 956 aac AU # Approved updates = 1 2012-04-10 22:47:00:107 956 aac AU ## RESUMED ## AU: Installing update [UpdateId = {B33ACEC1-3265-4D01-9C37-AC0892E95ED9}] 2012-04-10 22:47:13:773 2232 9fc Handler : WARNING: Exit code = 0x8024200B 2012-04-10 22:47:13:773 956 718 AU # WARNING: Install failed, error = 0x80070643 / 0x00009C48 2012-04-10 22:47:13:773 2232 9fc Handler ::::::::: 2012-04-10 22:47:13:773 2232 9fc Handler :: END :: Handler: Command Line Install 2012-04-10 22:47:13:773 2232 9fc Handler ::::::::::::: 2012-04-10 22:47:13:851 956 a7c Agent ********* 2012-04-10 22:47:13:851 956 a7c Agent ** END ** Agent: Installing updates [CallerId = AutomaticUpdates] 2012-04-10 22:47:13:851 956 718 AU Install call completed. 2012-04-10 22:47:13:851 956 a7c Agent ************* 2012-04-10 22:47:13:851 956 718 AU # WARNING: Install call completed, reboot required = No, error = 0x00000000 2012-04-10 22:47:13:851 956 718 AU ######### 2012-04-10 22:47:13:851 956 718 AU ## END ## AU: Installing updates [CallId = {FCFF2A5C-25AB-4FB9-AB2B-35C65CCA6A9F}] 2012-04-10 22:47:13:851 956 718 AU ############# 2012-04-10 22:47:13:851 956 718 AU Install complete for all calls, reboot NOT needed 2012-04-10 22:47:13:851 956 718 AU Setting AU scheduled install time to 2012-04-11 01:00:00 2012-04-10 22:47:13:851 956 718 AU Successfully wrote event for AU health state:0 2012-04-10 22:47:13:851 956 498 AU Getting featured update notifications. fIncludeDismissed = true 2012-04-10 22:47:13:851 956 498 AU No featured updates available. 2012-04-10 22:47:14:366 956 168 AU No featured updates notifications to show 2012-04-10 22:47:14:366 956 168 AU UpdateDownloadProperties: 0 download(s) are still in progress. 2012-04-10 22:47:14:366 956 168 AU Triggering Offline detection (non-interactive) 2012-04-10 22:47:14:366 956 168 AU AU setting pending client directive to 'Install Complete Ux' 2012-04-10 22:47:14:366 956 168 AU Changing existing AU client directive from 'Progress Ux' to 'Install Complete Ux', session id = 0x1 2012-04-10 22:47:14:366 956 168 AU Successfully wrote event for AU health state:0 2012-04-10 22:47:14:366 956 b78 AU ############# 2012-04-10 22:47:14:366 956 b78 AU ## START ## AU: Search for updates 2012-04-10 22:47:14:366 956 b78 AU ######### 2012-04-10 22:47:14:366 956 b78 AU ## RESUMED ## AU: Search for updates [CallId = {0198DD3A-D7B0-48F5-A77D-795F8A1BDCE8}] 2012-04-10 22:47:16:097 956 718 AU # 1 updates detected 2012-04-10 22:47:16:097 956 718 AU ######### 2012-04-10 22:47:16:097 956 718 AU ## END ## AU: Search for updates [CallId = {0198DD3A-D7B0-48F5-A77D-795F8A1BDCE8}] 2012-04-10 22:47:16:097 956 718 AU ############# 2012-04-10 22:47:16:097 956 718 AU No featured updates notifications to show 2012-04-10 22:47:16:097 956 718 AU Setting AU scheduled install time to 2012-04-11 01:00:00 2012-04-10 22:47:16:097 956 718 AU Successfully wrote event for AU health state:0 2012-04-10 22:47:16:097 956 718 AU Successfully wrote event for AU health state:0 2012-04-10 22:47:16:113 956 55c AU Getting featured update notifications. fIncludeDismissed = true 2012-04-10 22:47:16:113 956 55c AU No featured updates available. 2012-04-10 22:47:18:780 956 bb8 Report REPORT EVENT: {27479C66-E930-4F9C-AFF2-27EDD76DED8F} 2012-04-10 22:47:13:773+0200 1 182 101 {B33ACEC1-3265-4D01-9C37-AC0892E95ED9} 100 80070643 AutomaticUpdates Failure Content Install Installation Failure: Windows failed to install the following update with error 0x80070643: Windows Internet Explorer 9 for Windows 7 for x64-based Systems. 2012-04-10 22:47:18:780 956 bb8 Report CWERReporter::HandleEvents - WER report upload completed with status 0x8 2012-04-10 22:47:18:780 956 bb8 Report WER Report sent: 7.5.7601.17514 0x80070643 B33ACEC1-3265-4D01-9C37-AC0892E95ED9 Install 101 Unmanaged 2012-04-10 22:47:18:780 956 bb8 Report CWERReporter finishing event handling. (00000000) WU-IE9-Windows7-x64.exe The actual update that is executed is downloaded and stored at the following location: C:\Windows\SoftwareDistribution\Download\Install\WU-IE9-Windows7-x64.exe Executing that file manually, results in the following error message: IE9_main.log The IE9 installer/updater also creates an own log file located at C:\Windows\IE9_main.log For the update session in question, the installer logged: 00:00.000: ==================================================================== 00:00.016: Started: 2012/04/10 (Y/M/D) 23:10:53.897 (local) 00:00.032: Time Format in this log: MM:ss.mmm (minutes:seconds.milliseconds) 00:00.063: Command line: "C:\Windows\SoftwareDistribution\Download\Install\WU-IE9-Windows7-x64.exe" 00:00.078: INFO: Setup installer for Internet Explorer: 9.0.8112.16421 00:00.094: INFO: Previous version of Internet Explorer: 9.0.8112.16443 00:00.110: INFO: Checking if iexplore.exe's current version is between 9.0.6001.0... 00:00.125: INFO: ...and 9.1.0.0... 00:00.141: INFO: Maximum version on which to run IEAK branding is: 9.1.0.0... 00:00.156: ERROR: A newer version of Internet Explorer is already installed on the system. 00:00.188: ERROR: Internet Explorer version check failed. 01:03.789: INFO: Setup exit code: 0x00009C48 (40008) - A more recent version of Internet Explorer is installed. 01:03.820: INFO: Scheduling upload to IE SQM server: http://sqm.microsoft.com/sqm/ie/sqmserver.dll 01:03.852: INFO: SQM Upload returned 403 01:03.867: INFO: Cleaning up temporary files in: C:\Windows\TEMP\IE978E.tmp 01:03.883: INFO: Unable to remove directory C:\Windows\TEMP\IE978E.tmp, marking for deletion on reboot. 01:03.898: INFO: Released Internet Explorer Installer Mutex Which pretty much confirms what the error message says when executing the update manually; it's simply already installed or even obsolete because a newer version is installed. So, why does it try to keep installing the update? Possible solutions? Uninstalling Windows Internet Explorer 9 and manually installing the cached C:\Windows\SoftwareDistribution\Download\Install\WU-IE9-Windows7-x64.exe will result in the same error after applying all pending updates. Applying the FixIt for the issue You receive “0x80070643” or “0x643” error codes when you try to install .NET Framework updates through Windows Update or Microsoft Updates will not resolve the issue. Applying the suggested solution for the issue Error message when you try to install updates by using the Windows Update or Microsoft Update Web site: "0x80070003" will not resolve the issue. Running the FixIt Automatically diagnose and fix common problems with Windows Update does report having resolved issues with Windows Update, but didn't resolve the issue. Running the FixIt for the issue How to troubleshoot Windows Update or Microsoft Update when you are repeatedly offered an update does not resolve the issue. Neither with normal nor with aggressive settings.

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  • Slow filesystem access

    - by danneh3826
    I'm trying to diagnose a slow filesystem issue on a server I look after. It's been ongoing for quite some time, and I've run out of ideas as to what I can try. Here's the thick of it. The server itself is a Dell Poweredge T310. It has 4 SAS hard drives in it, configured at RAID5, and is running Citrix XenServer 5.6. The VM is a (relatively) old Debian 5.0.6 installation. It's given 4 cores, and 4Gb's of RAM. It has 3 volumes. A 10Gb volume (ext3) for the system, 980Gb volume (xfs) for data (~94% full), and another 200Gb volume (xfs) for data (~13% full). Now here's the weird thing. Read/write access to the 980Gb volume is really slow. I might get 5Mb/s out of it if I'm lucky. At first I figured it was actually disk access in the system, or at a hypervisor level, but ruled that out entirely as other VMs on the same host are running perfectly fine (a good couple hundred Mb/s disk r/w access). So then I started to target this particular VM. I started thinking it was XFS, but to prove it I wasn't going to attempt to change the filesystem on the 980Gb drive, with years and years of billions of files on there. So I provisioned the 200Gb drive, and did the same read/write test (basically dd), and got a good couple hundred Mb/s r/w access to it. So that ruled out the VM, the hardware, and the filesystem type. There's also a lot of these in /var/log/kern.log; (sorry, this is quite long) Sep 4 10:16:59 uriel kernel: [32571790.564689] httpd: page allocation failure. order:5, mode:0x4020 Sep 4 10:16:59 uriel kernel: [32571790.564693] Pid: 7318, comm: httpd Not tainted 2.6.32-4-686-bigmem #1 Sep 4 10:16:59 uriel kernel: [32571790.564696] Call Trace: Sep 4 10:16:59 uriel kernel: [32571790.564705] [<c1092a4d>] ? __alloc_pages_nodemask+0x476/0x4e0 Sep 4 10:16:59 uriel kernel: [32571790.564711] [<c1092ac3>] ? __get_free_pages+0xc/0x17 Sep 4 10:16:59 uriel kernel: [32571790.564716] [<c10b632e>] ? __kmalloc+0x30/0x128 Sep 4 10:16:59 uriel kernel: [32571790.564722] [<c11dd774>] ? pskb_expand_head+0x4f/0x157 Sep 4 10:16:59 uriel kernel: [32571790.564727] [<c11ddbbf>] ? __pskb_pull_tail+0x41/0x1fb Sep 4 10:16:59 uriel kernel: [32571790.564732] [<c11e4882>] ? dev_queue_xmit+0xe4/0x38e Sep 4 10:16:59 uriel kernel: [32571790.564738] [<c1205902>] ? ip_finish_output+0x0/0x5c Sep 4 10:16:59 uriel kernel: [32571790.564742] [<c12058c7>] ? ip_finish_output2+0x187/0x1c2 Sep 4 10:16:59 uriel kernel: [32571790.564747] [<c1204dc8>] ? ip_local_out+0x15/0x17 Sep 4 10:16:59 uriel kernel: [32571790.564751] [<c12055a9>] ? ip_queue_xmit+0x31e/0x379 Sep 4 10:16:59 uriel kernel: [32571790.564758] [<c1279a90>] ? _spin_lock_bh+0x8/0x1e Sep 4 10:16:59 uriel kernel: [32571790.564767] [<eda15a8d>] ? __nf_ct_refresh_acct+0x66/0xa4 [nf_conntrack] Sep 4 10:16:59 uriel kernel: [32571790.564773] [<c103bf42>] ? _local_bh_enable_ip+0x16/0x6e Sep 4 10:16:59 uriel kernel: [32571790.564779] [<c1214593>] ? tcp_transmit_skb+0x595/0x5cc Sep 4 10:16:59 uriel kernel: [32571790.564785] [<c1005c4f>] ? xen_restore_fl_direct_end+0x0/0x1 Sep 4 10:16:59 uriel kernel: [32571790.564791] [<c12165ea>] ? tcp_write_xmit+0x7a3/0x874 Sep 4 10:16:59 uriel kernel: [32571790.564796] [<c121203a>] ? tcp_ack+0x1611/0x1802 Sep 4 10:16:59 uriel kernel: [32571790.564801] [<c10055ec>] ? xen_force_evtchn_callback+0xc/0x10 Sep 4 10:16:59 uriel kernel: [32571790.564806] [<c121392f>] ? tcp_established_options+0x1d/0x8b Sep 4 10:16:59 uriel kernel: [32571790.564811] [<c1213be4>] ? tcp_current_mss+0x38/0x53 Sep 4 10:16:59 uriel kernel: [32571790.564816] [<c1216701>] ? __tcp_push_pending_frames+0x1e/0x50 Sep 4 10:16:59 uriel kernel: [32571790.564821] [<c1212246>] ? tcp_data_snd_check+0x1b/0xd2 Sep 4 10:16:59 uriel kernel: [32571790.564825] [<c1212de3>] ? tcp_rcv_established+0x5d0/0x626 Sep 4 10:16:59 uriel kernel: [32571790.564831] [<c121902c>] ? tcp_v4_do_rcv+0x15f/0x2cf Sep 4 10:16:59 uriel kernel: [32571790.564835] [<c1219561>] ? tcp_v4_rcv+0x3c5/0x5c0 Sep 4 10:16:59 uriel kernel: [32571790.564841] [<c120197e>] ? ip_local_deliver_finish+0x10c/0x18c Sep 4 10:16:59 uriel kernel: [32571790.564846] [<c12015a4>] ? ip_rcv_finish+0x2c4/0x2d8 Sep 4 10:16:59 uriel kernel: [32571790.564852] [<c11e3b71>] ? netif_receive_skb+0x3bb/0x3d6 Sep 4 10:16:59 uriel kernel: [32571790.564864] [<ed823efc>] ? xennet_poll+0x9b8/0xafc [xen_netfront] Sep 4 10:16:59 uriel kernel: [32571790.564869] [<c11e40ee>] ? net_rx_action+0x96/0x194 Sep 4 10:16:59 uriel kernel: [32571790.564874] [<c103bd4c>] ? __do_softirq+0xaa/0x151 Sep 4 10:16:59 uriel kernel: [32571790.564878] [<c103be24>] ? do_softirq+0x31/0x3c Sep 4 10:16:59 uriel kernel: [32571790.564883] [<c103befa>] ? irq_exit+0x26/0x58 Sep 4 10:16:59 uriel kernel: [32571790.564890] [<c118ff9f>] ? xen_evtchn_do_upcall+0x12c/0x13e Sep 4 10:16:59 uriel kernel: [32571790.564896] [<c1008c3f>] ? xen_do_upcall+0x7/0xc Sep 4 10:16:59 uriel kernel: [32571790.564899] Mem-Info: Sep 4 10:16:59 uriel kernel: [32571790.564902] DMA per-cpu: Sep 4 10:16:59 uriel kernel: [32571790.564905] CPU 0: hi: 0, btch: 1 usd: 0 Sep 4 10:16:59 uriel kernel: [32571790.564908] CPU 1: hi: 0, btch: 1 usd: 0 Sep 4 10:16:59 uriel kernel: [32571790.564911] CPU 2: hi: 0, btch: 1 usd: 0 Sep 4 10:16:59 uriel kernel: [32571790.564914] CPU 3: hi: 0, btch: 1 usd: 0 Sep 4 10:16:59 uriel kernel: [32571790.564916] Normal per-cpu: Sep 4 10:16:59 uriel kernel: [32571790.564919] CPU 0: hi: 186, btch: 31 usd: 175 Sep 4 10:16:59 uriel kernel: [32571790.564922] CPU 1: hi: 186, btch: 31 usd: 165 Sep 4 10:16:59 uriel kernel: [32571790.564925] CPU 2: hi: 186, btch: 31 usd: 30 Sep 4 10:16:59 uriel kernel: [32571790.564928] CPU 3: hi: 186, btch: 31 usd: 140 Sep 4 10:16:59 uriel kernel: [32571790.564931] HighMem per-cpu: Sep 4 10:16:59 uriel kernel: [32571790.564933] CPU 0: hi: 186, btch: 31 usd: 159 Sep 4 10:16:59 uriel kernel: [32571790.564936] CPU 1: hi: 186, btch: 31 usd: 22 Sep 4 10:16:59 uriel kernel: [32571790.564939] CPU 2: hi: 186, btch: 31 usd: 24 Sep 4 10:16:59 uriel kernel: [32571790.564942] CPU 3: hi: 186, btch: 31 usd: 13 Sep 4 10:16:59 uriel kernel: [32571790.564947] active_anon:485974 inactive_anon:121138 isolated_anon:0 Sep 4 10:16:59 uriel kernel: [32571790.564948] active_file:75215 inactive_file:79510 isolated_file:0 Sep 4 10:16:59 uriel kernel: [32571790.564949] unevictable:0 dirty:516 writeback:15 unstable:0 Sep 4 10:16:59 uriel kernel: [32571790.564950] free:230770 slab_reclaimable:36661 slab_unreclaimable:21249 Sep 4 10:16:59 uriel kernel: [32571790.564952] mapped:20016 shmem:29450 pagetables:5600 bounce:0 Sep 4 10:16:59 uriel kernel: [32571790.564958] DMA free:2884kB min:72kB low:88kB high:108kB active_anon:0kB inactive_anon:0kB active_file:5692kB inactive_file:724kB unevictable:0kB isolated(anon):0kB isolated(file):0kB present:15872kB mlocked:0kB dirty:8kB writeback:0kB mapped:0kB shmem:0kB slab_reclaimable:5112kB slab_unreclaimable:156kB kernel_stack:56kB pagetables:0kB unstable:0kB bounce:0kB writeback_tmp:0kB pages_scanned:0 all_unreclaimable? no Sep 4 10:16:59 uriel kernel: [32571790.564964] lowmem_reserve[]: 0 698 4143 4143 Sep 4 10:16:59 uriel kernel: [32571790.564977] Normal free:143468kB min:3344kB low:4180kB high:5016kB active_anon:56kB inactive_anon:2068kB active_file:131812kB inactive_file:131728kB unevictable:0kB isolated(anon):0kB isolated(file):0kB present:715256kB mlocked:0kB dirty:156kB writeback:0kB mapped:308kB shmem:4kB slab_reclaimable:141532kB slab_unreclaimable:84840kB kernel_stack:1928kB pagetables:22400kB unstable:0kB bounce:0kB writeback_tmp:0kB pages_scanned:0 all_unreclaimable? no Sep 4 10:16:59 uriel kernel: [32571790.564983] lowmem_reserve[]: 0 0 27559 27559 Sep 4 10:16:59 uriel kernel: [32571790.564995] HighMem free:776728kB min:512kB low:4636kB high:8760kB active_anon:1943840kB inactive_anon:482484kB active_file:163356kB inactive_file:185588kB unevictable:0kB isolated(anon):0kB isolated(file):0kB present:3527556kB mlocked:0kB dirty:1900kB writeback:60kB mapped:79756kB shmem:117796kB slab_reclaimable:0kB slab_unreclaimable:0kB kernel_stack:0kB pagetables:0kB unstable:0kB bounce:0kB writeback_tmp:0kB pages_scanned:0 all_unreclaimable? no Sep 4 10:16:59 uriel kernel: [32571790.565001] lowmem_reserve[]: 0 0 0 0 Sep 4 10:16:59 uriel kernel: [32571790.565011] DMA: 385*4kB 16*8kB 3*16kB 9*32kB 6*64kB 2*128kB 1*256kB 0*512kB 0*1024kB 0*2048kB 0*4096kB = 2900kB Sep 4 10:16:59 uriel kernel: [32571790.565032] Normal: 21505*4kB 6508*8kB 273*16kB 24*32kB 3*64kB 0*128kB 0*256kB 0*512kB 0*1024kB 0*2048kB 0*4096kB = 143412kB Sep 4 10:16:59 uriel kernel: [32571790.565054] HighMem: 949*4kB 8859*8kB 7063*16kB 6186*32kB 4631*64kB 727*128kB 6*256kB 0*512kB 0*1024kB 0*2048kB 0*4096kB = 776604kB Sep 4 10:16:59 uriel kernel: [32571790.565076] 198980 total pagecache pages Sep 4 10:16:59 uriel kernel: [32571790.565079] 14850 pages in swap cache Sep 4 10:16:59 uriel kernel: [32571790.565082] Swap cache stats: add 2556273, delete 2541423, find 82961339/83153719 Sep 4 10:16:59 uriel kernel: [32571790.565085] Free swap = 250592kB Sep 4 10:16:59 uriel kernel: [32571790.565087] Total swap = 385520kB Sep 4 10:16:59 uriel kernel: [32571790.575454] 1073152 pages RAM Sep 4 10:16:59 uriel kernel: [32571790.575458] 888834 pages HighMem Sep 4 10:16:59 uriel kernel: [32571790.575461] 11344 pages reserved Sep 4 10:16:59 uriel kernel: [32571790.575463] 1090481 pages shared Sep 4 10:16:59 uriel kernel: [32571790.575465] 737188 pages non-shared Now, I've no idea what this means. There's plenty of free memory; total used free shared buffers cached Mem: 4247232 3455904 791328 0 5348 736412 -/+ buffers/cache: 2714144 1533088 Swap: 385520 131004 254516 Though now I see the swap is relatively low in size, but would that matter? I've been starting to think about fragmentation, or inode usage on that large partition, but a recent fsck on it showed is as only like 0.5% fragmented. Which leaves me with inode usage, but how much of an effect really would a large inode table or filesystem TOC have? I've love to hear people's opinions on this. It's driving me potty! df -h output; Filesystem Size Used Avail Use% Mounted on /dev/xvda1 9.5G 6.6G 2.4G 74% / tmpfs 2.1G 0 2.1G 0% /lib/init/rw udev 10M 520K 9.5M 6% /dev tmpfs 2.1G 0 2.1G 0% /dev/shm /dev/xvdb 980G 921G 59G 94% /data

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  • Dealing with external processes

    - by Jesse Aldridge
    I've been working on a gui app that needs to manage external processes. Working with external processes leads to a lot of issues that can make a programmer's life difficult. I feel like maintenence on this app is taking an unacceptably long time. I've been trying to list the things that make working with external processes difficult so that I can come up with ways of mitigating the pain. This kind of turned into a rant which I thought I'd post here in order to get some feedback and to provide some guidance to anybody thinking about sailing into these very murky waters. Here's what I've got so far: Output from the child can get mixed up with output from the parent. This can make both outputs misleading and hard to read. It can be hard to tell what came from where. It becomes harder to figure out what's going on when things are asynchronous. Here's a contrived example: import textwrap, os, time from subprocess import Popen test_path = 'test_file.py' with open(test_path, 'w') as file: file.write(textwrap.dedent(''' import time for i in range(3): print 'Hello %i' % i time.sleep(1)''')) proc = Popen('python -B "%s"' % test_path) for i in range(3): print 'Hello %i' % i time.sleep(1) os.remove(test_path) I guess I could have the child process write its output to a file. But it can be annoying to have to open up a file every time I want to see the result of a print statement. If I have code for the child process I could add a label, something like print 'child: Hello %i', but it can be annoying to do that for every print. And it adds some noise to the output. And of course I can't do it if I don't have access to the code. I could manually manage the process output. But then you open up a huge can of worms with threads and polling and stuff like that. A simple solution is to treat processes like synchronous functions, that is, no further code executes until the process completes. In other words, make the process block. But that doesn't work if you're building a gui app. Which brings me to the next problem... Blocking processes cause the gui to become unresponsive. import textwrap, sys, os from subprocess import Popen from PyQt4.QtGui import * from PyQt4.QtCore import * test_path = 'test_file.py' with open(test_path, 'w') as file: file.write(textwrap.dedent(''' import time for i in range(3): print 'Hello %i' % i time.sleep(1)''')) app = QApplication(sys.argv) button = QPushButton('Launch process') def launch_proc(): # Can't move the window until process completes proc = Popen('python -B "%s"' % test_path) proc.communicate() button.connect(button, SIGNAL('clicked()'), launch_proc) button.show() app.exec_() os.remove(test_path) Qt provides a process wrapper of its own called QProcess which can help with this. You can connect functions to signals to capture output relatively easily. This is what I'm currently using. But I'm finding that all these signals behave suspiciously like goto statements and can lead to spaghetti code. I think I want to get sort-of blocking behavior by having the 'finished' signal from QProcess call a function containing all the code that comes after the process call. I think that should work but I'm still a bit fuzzy on the details... Stack traces get interrupted when you go from the child process back to the parent process. If a normal function screws up, you get a nice complete stack trace with filenames and line numbers. If a subprocess screws up, you'll be lucky if you get any output at all. You end up having to do a lot more detective work everytime something goes wrong. Speaking of which, output has a way of disappearing when dealing external processes. Like if you run something via the windows 'cmd' command, the console will pop up, execute the code, and then disappear before you have a chance to see the output. You have to pass the /k flag to make it stick around. Similar issues seem to crop up all the time. I suppose both problems 3 and 4 have the same root cause: no exception handling. Exception handling is meant to be used with functions, it doesn't work with processes. Maybe there's some way to get something like exception handling for processes? I guess that's what stderr is for? But dealing with two different streams can be annoying in itself. Maybe I should look into this more... Processes can hang and stick around in the background without you realizing it. So you end up yelling at your computer cuz it's going so slow until you finally bring up your task manager and see 30 instances of the same process hanging out in the background. Also, hanging background processes can interefere with other instances of the process in various fun ways, such as causing permissions errors by holding a handle to a file or someting like that. It seems like an easy solution to this would be to have the parent process kill the child process on exit if the child process didn't close itself. But if the parent process crashes, cleanup code might not get called and the child can be left hanging. Also, if the parent waits for the child to complete, and the child is in an infinite loop or something, you can end up with two hanging processes. This problem can tie in to problem 2 for extra fun, causing your gui to stop responding entirely and force you to kill everything with the task manager. F***ing quotes Parameters often need to be passed to processes. This is a headache in itself. Especially if you're dealing with file paths. Say... 'C:/My Documents/whatever/'. If you don't have quotes, the string will often be split at the space and interpreted as two arguments. If you need nested quotes you can use ' and ". But if you need to use more than two layers of quotes, you have to do some nasty escaping, for example: "cmd /k 'python \'path 1\' \'path 2\''". A good solution to this problem is passing parameters as a list rather than as a single string. Subprocess allows you to do this. Can't easily return data from a subprocess. You can use stdout of course. But what if you want to throw a print in there for debugging purposes? That's gonna screw up the parent if it's expecting output formatted a certain way. In functions you can print one string and return another and everything works just fine. Obscure command-line flags and a crappy terminal based help system. These are problems I often run into when using os level apps. Like the /k flag I mentioned, for holding a cmd window open, who's idea was that? Unix apps don't tend to be much friendlier in this regard. Hopefully you can use google or StackOverflow to find the answer you need. But if not, you've got a lot of boring reading and frusterating trial and error to do. External factors. This one's kind of fuzzy. But when you leave the relatively sheltered harbor of your own scripts to deal with external processes you find yourself having to deal with the "outside world" to a much greater extent. And that's a scary place. All sorts of things can go wrong. Just to give a random example: the cwd in which a process is run can modify it's behavior. There are probably other issues, but those are the ones I've written down so far. Any other snags you'd like to add? Any suggestions for dealing with these problems?

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  • Java MVC project - either I can't update the drawing, or I can't see it

    - by user1881164
    I've got a project based around the Model-View-Controller paradigm, and I've been having a lot of trouble with getting it to work properly. The program has 4 panels, which are supposed to allow me to modify an oval drawn on the screen in various ways. These seem to work fine, and after considerable trouble I was able to get them to display in the JFrame which holds the whole shebang. I've managed to get them to display by breaking away from the provided instructions, but when I do that, I can't seem to get the oval to update. However, if I follow the directions to the letter, I only ever see an empty frame. The project had pretty specific directions, which I followed up to a point, but some of the documentation was unclear. I think what I'm missing must be something simple, since nothing is jumping out at me as not making sense. I have to admit though that my Java experience is limited and my experience with GUI design/paradigms is even more so. Anyway, I've been searching the web and this site extensively trying to figure out what's wrong, but this is a somewhat specific example and honestly I just don't know enough about this to generalize any of the answers I've found online and figure out what's missing. I've been poring over this code for far too long now so I'm really hoping someone can help me out. public class Model { private Controller controller; private View view; private MvcFrame mvcFrame; private int radius = 44; private Color color = Color.BLUE; private boolean solid = true; //bunch of mutators and accessors for the above variables public Model() { controller = new Controller(this); view = new View(this); mvcFrame = new MvcFrame(this); } } Here's the model class. This seems to be fairly simple. I think my understanding of what's going on here is solid, and nothing seems to be wrong. Included mostly for context. public class Controller extends JPanel{ private Model model; public Controller(Model model) { this.model = model; setBorder(BorderFactory.createLineBorder(Color.GREEN)); setLayout(new GridLayout(4,1)); add(new RadiusPanel(model)); add(new ColorPanel(model)); add(new SolidPanel(model)); add(new TitlePanel(model)); } } This is the Controller class. As far as I can tell, the setBorder, setLayout, and series of adds do nothing here. I had them commented out, but this is the way that the instructions told me to do things, so either there's a mistake there or something about my setup is wrong. However, when I did it this way, I would get an empty window (JFrame) but none of the panels would show up in it. What I did to fix this is put those add functions in the mvcFrame class: public class MvcFrame extends JFrame { private Model model; public MvcFrame(Model model){ this.model = model; //setLayout(new GridLayout(4,1)); //add(new RadiusPanel(model)); //add(new ColorPanel(model)); //add(new SolidPanel(model)); //add(new TitlePanel(model)); //add(new View(model)); setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); setLocationRelativeTo(null); setSize(800,600); setVisible(true); } } So here's where things kind of started getting weird. The first block of commented out code is the same as what's in the Controller class. The reason I have it commented out is because that was just a lucky guess - it's not supposed to be like that according to the instructions. However, this did work for getting the panels to show up - but at that point I was still tearing my hair out trying to get the oval to display. The other commented line ( add(new View(model)); ) was a different attempt at making things work. In this case, I put those add functions in the View class (see commented out code below). This actually worked to display both the oval and the panels, but that method wouldn't allow me to update the oval. Also, though I just had the oval displaying, I can't seem to figure out what exactly made that happen, and I can't seem to make it come back. public class View extends JPanel{ private Model model; public View(Model model) { this.model = model; //setLayout(new GridLayout(4,1)); //add(new RadiusPanel(model)); //add(new ColorPanel(model)); //add(new SolidPanel(model)); //add(new TitlePanel(model)); repaint(); } @Override protected void paintComponent(Graphics g){ super.paintComponent(g); //center of view panel, in pixels: int xCenter = getWidth()/2; int yCenter = getHeight()/2; int radius = model.getRadius(); int xStart = xCenter - radius; int yStart = yCenter - radius; int xWidth = 2 * radius; int yHeight = 2 * radius; g.setColor(model.getColor()); g.clearRect(0, 0, getWidth(), getHeight()); if (model.isSolid()){ g.fillOval(xStart, yStart, xWidth, yHeight); } else { g.drawOval(xStart, yStart, xWidth, yHeight); } } } Kinda same idea as before - the commented out code is stuff I added to try to get things working, but is not based on the provided directions. In the case where that stuff was uncommented, I had the add(new View(model)); line from the mvcFrame line uncommented as well. The various panel classes (SolidPanel, ColorPanel, etc) simply extend a class called ControlPanel which extends JPanel. These all seem to work as expected, not having much issue with them. There is also a driver which launches the GUI. This also seems to work as expected. The main problem I'm having is that I can't get the oval to show up, and the one time I could make it show up, none of the options for changing it seemed to work. I feel like I'm close but I'm just at a loss for other things to try out at this point. Anyone who can help will have my sincerest gratitude.

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