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• Windows Service Limit Crashes Services on Startup

  - by Paul Williams

  We have developed a custom Windows service in C# as part of a large Enterprise application. Our QA department tests multiple versions of this service. The QA lab has several (over 20) copies of this service installed on one Windows 2003 test box. Each copy is in its own folder and has a unique service name, though each executable file is named the same (OurWindowsService.exe, for example). Each service uses the same Windows credentials (a domain user). The purpose of this service is to handle MSMQ messages. The queued messages do all sorts of important stuff. For some reason, they can run only 5 of these services at a time. When we start a 6th, the service crashes on startup. For example, I can start #1, #2, #3, #4, and #5. When I start #6, it crashes. However, if I stop #1 and start #6, #6 runs fine, and now #1 fails to start. When the services crash, the following error appears in the Windows event log: Faulting application OurWindowsService.exe, version 5.40.1.1, faulting module kernel32.dll, version 5.2.3790.4480, fault address 0x0000bef7. I was able to use WinDbg to generate a postmortem dump file. The dump file revealed that the crash occurs trying to delay load SHLWAPI.dll: 0:000> kb100 ChildEBP RetAddr Args to Child 0012ece4 79037966 c06d007e 00000000 00000001 KERNEL32!RaiseException+0x53 0012ed4c 790099ba 00000008 0012ed08 7c82860c mscoree!__delayLoadHelper2+0x139 0012ed98 790075b1 001550c8 0012edac 0012fb34 mscoree!_tailMerge_**SHLWAPI_dll**+0xd 0012edb0 79007623 001550c8 0012edf8 0012edf4 mscoree!XMLGetVersionWithSupported+0x22 0012ee00 790069a4 aa06f1b0 00000000 000001fe mscoree!RuntimeRequest::GetRuntimeVersion+0x56 0012f478 790077aa 00000001 7903fb4c 0012fb34 mscoree!RuntimeRequest::ComputeVersionString+0x5bd 0012f89c 79007802 00000001 0012f8b4 7903fb4c mscoree!RuntimeRequest::FindVersionedRuntime+0x11c 0012f8b8 79007b19 00000001 00000000 aa06fa6c mscoree!RuntimeRequest::RequestRuntimeDll+0x2c 0012ffa4 79007c02 00000001 0012ffbc 00000000 mscoree!GetInstallation+0x72 0012ffc0 77e6f23b 00000000 00000000 7ffdf000 mscoree!_CorExeMain+0x12 0012fff0 00000000 79007bf0 00000000 78746341 KERNEL32!BaseProcessStart+0x23 I believe the error code handed to Kernel32.RaiseException, c06d007e, means Module Not Found, but I'm not certain. Does this sound familiar to anyone? Are we hitting some limit on the number of service instances on some file name? Does MSMQ dislike more than 5 listening services?

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• How know when my mongoDB database overhead ?

  - by shingara

  I installed a MongoDB database on my server. My server is in 32Bit and I can't change it soon. When you use MongoDB in a 32Bit architecture you have a limit of 2,5Go of data, as mentionned in this MongoDB blog post. The thing is that I have several database. So how can I know if I am close or not to this limit ?

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• How to SUM() from an offset through the end of the table?

  - by keithjgrant

  If SELECT SUM(amount) FROM transactions ORDER BY order LIMIT 0, 50 sums the amount field for the first 50 records in a table, how do a sum all records after the first 50? In other words, I'd like to do something like SELECT SUM(amount) from transactions ORDER BY order LIMIT 50, *, but that doesn't work.

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• Is Http POST limitless?

  - by 01

  I heard that POST has no limit in data size it can be send by it, is that true or is there some really high limit?

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• Why is my implementation of the Sieve of Atkin overlooking numbers close to the specified limit?

  - by Ross G

  My implementation either overlooks primes near the limit or composites near the limit. while some limits work and others don't. I'm am completely confused as to what is wrong. def AtkinSieve (limit): results = [2,3,5] sieve = [False]*limit factor = int(math.sqrt(lim)) for i in range(1,factor): for j in range(1, factor): n = 4*i**2+j**2 if (n <= lim) and (n % 12 == 1 or n % 12 == 5): sieve[n] = not sieve[n] n = 3*i**2+j**2 if (n <= lim) and (n % 12 == 7): sieve[n] = not sieve[n] if i>j: n = 3*i**2-j**2 if (n <= lim) and (n % 12 == 11): sieve[n] = not sieve[n] for index in range(5,factor): if sieve[index]: for jndex in range(index**2, limit, index**2): sieve[jndex] = False for index in range(7,limit): if sieve[index]: results.append(index) return results For example, when I generate a primes to the limit of 1000, the Atkin sieve misses the prime 997, but includes the composite 965. But if I generate up the limit of 5000, the list it returns is completely correct.

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• Why is my implementation of the Sieve of Atkin overlooking numbers close to the specified limit?

  - by Ross G

  My implementation either overlooks primes near the limit or composites near the limit. while some limits work and others don't. I'm am completely confused as to what is wrong. def AtkinSieve (limit): results = [2,3,5] sieve = [False]*limit factor = int(math.sqrt(lim)) for i in range(1,factor): for j in range(1, factor): n = 4*i**2+j**2 if (n <= lim) and (n % 12 == 1 or n % 12 == 5): sieve[n] = not sieve[n] n = 3*i**2+j**2 if (n <= lim) and (n % 12 == 7): sieve[n] = not sieve[n] if i>j: n = 3*i**2-j**2 if (n <= lim) and (n % 12 == 11): sieve[n] = not sieve[n] for index in range(5,factor): if sieve[index]: for jndex in range(index**2, limit, index**2): sieve[jndex] = False for index in range(7,limit): if sieve[index]: results.append(index) return results For example, when I generate a primes to the limit of 1000, the Atkin sieve misses the prime 997, but includes the composite 965. But if I generate up the limit of 5000, the list it returns is completely correct.

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• CUPS basic auth error through web interface

  - by Inaimathi

  I'm trying to configure CUPS to allow remote administration through the web interface. There's enough documentation out there that I can figure out what to change in my cupsd.conf (changing Listen localhost:631 to Port 631, and adding Allow @LOCAL to the /, /admin and /admin/conf sections). I'm now at the point where I can see the CUPS interface from another machine on the same network. The trouble is, when I try to Add Printer, I'm asked for a username and password, but my response is rejected even when I know I've gotten it right (I assume it's asking for the username and password of someone in the lpadmin group on the server machine; I've sshed in with credentials its rejecting, and the user I'm using has been added to the lpadmin group). If I disable auth outright, by changing DefaultAuthType Basic to DefaultAuthType None, I get an "Unauthorized" error instead of a password request when I try to Add Printer. What am I doing wrong? Is there a way of letting users from the local network to administer the print server through the CUPS web interface? EDIT: By request, my complete cupsd.conf (spoiler: minimally edited default config file that comes with the edition of CUPS from the Debian wheezy repos): LogLevel warn MaxLogSize 0 SystemGroup lpadmin Port 631 # Listen localhost:631 Listen /var/run/cups/cups.sock Browsing On BrowseOrder allow,deny BrowseAllow all BrowseLocalProtocols CUPS dnssd # DefaultAuthType Basic DefaultAuthType None WebInterface Yes <Location /> Order allow,deny Allow @LOCAL </Location> <Location /admin> Order allow,deny Allow @LOCAL </Location> <Location /admin/conf> AuthType Default Require user @SYSTEM Order allow,deny Allow @LOCAL </Location> # Set the default printer/job policies... <Policy default> # Job/subscription privacy... JobPrivateAccess default JobPrivateValues default SubscriptionPrivateAccess default SubscriptionPrivateValues default # Job-related operations must be done by the owner or an administrator... <Limit Create-Job Print-Job Print-URI Validate-Job> Order deny,allow </Limit> <Limit Send-Document Send-URI Hold-Job Release-Job Restart-Job Purge-Jobs Set-Job-Attributes Create-Job-Subscription Renew-Subscription Cancel-Subscription Get-Notifications Reprocess-Job Cancel-Current-Job Suspend-Current-Job Resume-Job Cancel-My-Jobs Close-Job CUPS-Move-Job CUPS-Get-Document> Require user @OWNER @SYSTEM Order deny,allow </Limit> # All administration operations require an administrator to authenticate... <Limit CUPS-Add-Modify-Printer CUPS-Delete-Printer CUPS-Add-Modify-Class CUPS-Delete-Class CUPS-Set-Default CUPS-Get-Devices> AuthType Default Require user @SYSTEM Order deny,allow </Limit> # All printer operations require a printer operator to authenticate... <Limit Pause-Printer Resume-Printer Enable-Printer Disable-Printer Pause-Printer-After-Current-Job Hold-New-Jobs Release-Held-New-Jobs Deactivate-Printer Activate-Printer Restart-Printer Shutdown-Printer Startup-Printer Promote-Job Schedule-Job-After Cancel-Jobs CUPS-Accept-Jobs CUPS-Reject-Jobs> AuthType Default Require user @SYSTEM Order deny,allow </Limit> # Only the owner or an administrator can cancel or authenticate a job... <Limit Cancel-Job CUPS-Authenticate-Job> Require user @OWNER @SYSTEM Order deny,allow </Limit> <Limit All> Order deny,allow </Limit> </Policy> # Set the authenticated printer/job policies... <Policy authenticated> # Job/subscription privacy... JobPrivateAccess default JobPrivateValues default SubscriptionPrivateAccess default SubscriptionPrivateValues default # Job-related operations must be done by the owner or an administrator... <Limit Create-Job Print-Job Print-URI Validate-Job> AuthType Default Order deny,allow </Limit> <Limit Send-Document Send-URI Hold-Job Release-Job Restart-Job Purge-Jobs Set-Job-Attributes Create-Job-Subscription Renew-Subscription Cancel-Subscription Get-Notifications Reprocess-Job Cancel-Current-Job Suspend-Current-Job Resume-Job Cancel-My-Jobs Close-Job CUPS-Move-Job CUPS-Get-Document> AuthType Default Require user @OWNER @SYSTEM Order deny,allow </Limit> # All administration operations require an administrator to authenticate... <Limit CUPS-Add-Modify-Printer CUPS-Delete-Printer CUPS-Add-Modify-Class CUPS-Delete-Class CUPS-Set-Default> AuthType Default Require user @SYSTEM Order deny,allow </Limit> # All printer operations require a printer operator to authenticate... <Limit Pause-Printer Resume-Printer Enable-Printer Disable-Printer Pause-Printer-After-Current-Job Hold-New-Jobs Release-Held-New-Jobs Deactivate-Printer Activate-Printer Restart-Printer Shutdown-Printer Startup-Printer Promote-Job Schedule-Job-After Cancel-Jobs CUPS-Accept-Jobs CUPS-Reject-Jobs> AuthType Default Require user @SYSTEM Order deny,allow </Limit> # Only the owner or an administrator can cancel or authenticate a job... <Limit Cancel-Job CUPS-Authenticate-Job> AuthType Default Require user @OWNER @SYSTEM Order deny,allow </Limit> <Limit All> Order deny,allow </Limit> </Policy>

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• Wifi range issues and intermittent dropouts, Thinkpad Edge

  - by jimbo

  If I am more than a couple of metres from my access point (and I'm seeing this across various APs) with my newish Thinkpad Edge 15, running 10.10, the wifi performance becomes ... flaky. When this is happening, I see the following in dmesg, although I'm not sure if it's related: [ 2497.011099] intel ips 0000:00:1f.6: CPU power or thermal limit exceeded [ 2502.012711] intel ips 0000:00:1f.6: CPU power or thermal limit exceeded [ 2507.009254] intel ips 0000:00:1f.6: CPU power or thermal limit exceeded [ 2512.008367] intel ips 0000:00:1f.6: CPU power or thermal limit exceeded [ 2517.007467] intel ips 0000:00:1f.6: CPU power or thermal limit exceeded [ 2522.006558] intel ips 0000:00:1f.6: CPU power or thermal limit exceeded [ 2527.008157] intel ips 0000:00:1f.6: CPU power or thermal limit exceeded [ 2532.007251] intel ips 0000:00:1f.6: CPU power or thermal limit exceeded [ 2537.003838] intel ips 0000:00:1f.6: CPU power or thermal limit exceeded [ 2542.005427] intel ips 0000:00:1f.6: CPU power or thermal limit exceeded [ 2547.004496] intel ips 0000:00:1f.6: CPU power or thermal limit exceeded [ 2552.003611] intel ips 0000:00:1f.6: CPU power or thermal limit exceeded lspci -vvv has the following to say about my wireless adapter: 03:00.0 Network controller: Intel Corporation Centrino Wireless-N 1000 Subsystem: Intel Corporation Centrino Wireless-N 1000 BGN Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B- DisINTx- Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx- Latency: 0, Cache Line Size: 64 bytes Interrupt: pin A routed to IRQ 49 Region 0: Memory at f0500000 (64-bit, non-prefetchable) [size=8K] Capabilities: <access denied> Kernel driver in use: iwlagn Kernel modules: iwlagn If I get within a couple of metres of the access point, I still see that output in dmesg, but the connection stabilises. My question is threefold: how do I get better wifi range, what can/should I do about those messages in dmesg, and most crucially, are the two related? As ever let me know if there's other information that would help! Edit: I am using this machine in exactly the same locations I used my previous Thinkpad (T61) running various older versions of Ubuntu, so I definitely feel there is something wrong, rather me having unreasonable expectations of range!

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• limiting connections from tomcat to IIS - proxy? iptables?

  - by Chris Phillips

  Howdy, I've webapp on tomcat6 which is connecting to an M$ PlayReady DRM instance on IIS6.0 The performance is seen to be best when we bench mark (using ab) the DRM service with 25 concurrent connections, which gives about 250 requests per second, which is ace. higher concurrent connections results in TCP/IP timeouts and other lower level mess. But there is no way to control how the tomcat app connects to the service - it's not internally managing a pool of connections etc, they are all isolated http connections to the server. Ideally I'd like a situation where we can have 25 http 1.1 connections being kept alive permanently from tomcat and requesting the licenses through this static pool of connections, which I think would the best performance. But this is not in the code, so was looking for a way to possibly simulate this at the Linux level. I was possibly thinking that iptables connlimit might be able to gracefully handle these connections, but whilst it could limit, it'd probably still annoy the app. What about a proxy? nginx (or possibly squid) seems potentially appealing to run on the tomcat server and hit on localhost as we might want to add additional DRM servers to use under load balance anyway. Could this take 100 incoming connections from tomcat, accept them all and proxy over the the IIS server in a more respectful manner? Any other angles? EDIT - looking over mod_proxy for apache, which we are already using for conventional use on an apache instance in front of this tomcat instance, might be ideal. I can set a max value on the proxy_pass to only allow 25 connections, and keep them alive permanently. Is that my answer? Many thanks, Chris

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• what should be limit to use for IPTABLE rate limiting for a webserver

  - by Registered User

  I see on my webserver some logs as follows 203.252.157.98 - :25:02 "GET //phpmyadmin/ HTTP/1.1" 404 393 "-" "Made by ZmEu @ WhiteHat Team - www.whitehat.ro" 203.252.157.98 - :25:03 "GET //phpMyAdmin/ HTTP/1.1" 404 394 "-" "Made by ZmEu @ WhiteHat Team - www.whitehat.ro" 203.252.157.98 - :25:03 "GET //pma/ HTTP/1.1" 404 388 "-" "Made by ZmEu @ WhiteHat Team - www.whitehat.ro" 203.252.157.98 - :25:04 "GET //dbadmin/ HTTP/1.1" 404 391 "-" "Made by ZmEu @ WhiteHat Team - www.whitehat.ro" 203.252.157.98 - :25:05 "GET //myadmin/ HTTP/1.1" 404 391 "-" "Made by ZmEu @ WhiteHat Team - www.whitehat.ro" 203.252.157.98 - :25:06 "GET //phppgadmin/ HTTP/1.1" 404 394 "-" "Made by ZmEu @ WhiteHat Team - www.whitehat.ro" 203.252.157.98 - :25:06 "GET //PMA/ HTTP/1.1" 404 389 "-" "Made by ZmEu @ WhiteHat Team - www.whitehat.ro" 203.252.157.98 - :25:07 "GET //admin/ HTTP/1.1" 404 389 "-" "Made by ZmEu @ WhiteHat Team - www.whitehat.ro" 203.252.157.98 - :25:08 "GET //MyAdmin/ HTTP/1.1" 404 392 "-" "Made by ZmEu @ WhiteHat Team - www.whitehat.ro" 203.252.157.98 - :27:36 "GET //phpmyadmin/ HTTP/1.1" 404 393 "-" "Made by ZmEu @ WhiteHat Team - www.whitehat.ro" 203.252.157.98 - :27:42 "GET //phpMyAdmin/ HTTP/1.1" 404 394 "-" "Made by ZmEu @ WhiteHat Team - www.whitehat.ro" 203.252.157.98 - :27:42 "GET //pma/ HTTP/1.1" 404 388 "-" "Made by ZmEu @ WhiteHat Team - www.whitehat.ro" 203.252.157.98 - :27:43 "GET //dbadmin/ HTTP/1.1" 404 391 "-" "Made by ZmEu @ WhiteHat Team - www.whitehat.ro" 203.252.157.98 - - "GET //myadmin/ HTTP/1.1" 404 391 "-" "Made by ZmEu @ WhiteHat Team - www.whitehat.ro" and some more as follows 118.219.234.254 - - [19/Oct/2010:22:57:41 "GET /pma/scripts/setup.php HTTP/1.1" 404 399 "-" "Mozilla/4.0 (compatible; MSIE 6.0; Windows 98)" 118.219.234.254 - - [19/Oct/2010:22:57:41 "GET /scripts/setup.php HTTP/1.1" 404 397 "-" "Mozilla/4.0 (compatible; MSIE 6.0; Windows 98)" 118.219.234.254 - - [19/Oct/2010:22:57:42 "GET /sqlweb/scripts/setup.php HTTP/1.1" 404 401 "-" "Mozilla/4.0 (compatible; MSIE 6.0; Windows 98)" 118.219.234.254 - - [19/Oct/2010:22:57:42 "GET /web/phpMyAdmin/scripts/setup.php HTTP/1.1" 404 408 "-" "Mozilla/4.0 (compatible; MSIE 6.0; Windows 98)" 118.219.234.254 - - [19/Oct/2010:22:57:43 "GET /web/phpmyadmin/scripts/setup.php HTTP/1.1" 404 408 "-" "Mozilla/4.0 (compatible; MSIE 6.0; Windows 98)" 118.219.234.254 - - [19/Oct/2010:22:57:44 "GET /web/scripts/setup.php HTTP/1.1" 404 400 "-" "Mozilla/4.0 (compatible; MSIE 6.0; Windows 98)" 118.219.234.254 - - [19/Oct/2010:22:57:44 "GET /webadmin/scripts/setup.php HTTP/1.1" 404 403 "-" "Mozilla/4.0 (compatible; MSIE 6.0; Windows 98)" 118.219.234.254 - - [19/Oct/2010:22:57:45 "GET /webdb/scripts/setup.php HTTP/1.1" 404 401 "-" "Mozilla/4.0 (compatible; MSIE 6.0; Windows 98)" 118.219.234.254 - - [19/Oct/2010:22:57:45 "GET /websql/scripts/setup.php HTTP/1.1" 404 401 "-" "Mozilla/4.0 (compatible; MSIE 6.0; Windows 98)" 118.219.234.254 - - [19/Oct/2010:05:38:51 "GET /admin/phpmyadmin/scripts/setup.php HTTP/1.1" 404 407 "-" "Mozilla/4.0 (compatible; MSIE 6.0; Windows 98)" 118.219.234.254 - - [19/Oct/2010:05:38:52 "GET /admin/pma/scripts/setup.php HTTP/1.1" 404 404 "-" "Mozilla/4.0 (compatible; MSIE 6.0; Windows 98)" 118.219.234.254 - - [19/Oct/2010:05:38:52 "GET /admin/scripts/setup.php HTTP/1.1" 404 401 "-" "Mozilla/4.0 (compatible; MSIE 6.0; Windows 98)" 118.219.234.254 - - [19/Oct/2010:05:38:53 "GET /db/scripts/setup.php HTTP/1.1" 404 399 "-" "Mozilla/4.0 (compatible; MSIE 6.0; Windows 98)" 118.219.234.254 - - [19/Oct/2010:05:38:54 "GET /dbadmin/scripts/setup.php HTTP/1.1" 404 402 "-" "Mozilla/4.0 (compatible; MSIE 6.0; Windows 98)" 118.219.234.254 - - [19/Oct/2010:05:38:54 "GET /myadmin/scripts/setup.php HTTP/1.1" 404 403 "-" "Mozilla/4.0 (compatible; MSIE 6.0; Windows 98)" 118.219.234.254 - - [19/Oct/2010:05:38:55 "GET /mysql/scripts/setup.php HTTP/1.1" 404 401 "-" "Mozilla/4.0 (compatible; MSIE 6.0; Windows 98)" 118.219.234.254 - - [19/Oct/2010:05:38:55 "GET /mysqladmin/scripts/setup.php HTTP/1.1" 404 405 "-" "Mozilla/4.0 (compatible; MSIE 6.0; Windows 98)" 118.219.234.254 - - [19/Oct/2010:05:38:56 "GET /phpMyAdmin/scripts/setup.php HTTP/1.1" 404 405 "-" "Mozilla/4.0 (compatible; MSIE 6.0; Windows 98)" 118.219.234.254 - - [19/Oct/2010:05:38:56 "GET /phpadmin/scripts/setup.php HTTP/1.1" 404 403 "-" "Mozilla/4.0 (compatible; MSIE 6.0; Windows 98)" 118.219.234.254 - - [19/Oct/2010:05:38:57 "GET /phpmyadmin/scripts/setup.php HTTP/1.1" 404 404 "-" "Mozilla/4.0 (compatible; MSIE 6.0; Windows 98)" 118.219.234.254 - - [19/Oct/2010:05:38:57 "GET /pma/scripts/setup.php HTTP/1.1" 404 399 "-" "Mozilla/4.0 (compatible; MSIE 6.0; Windows 98)" 118.219.234.254 - - [19/Oct/2010:05:38:58 "GET /scripts/setup.php HTTP/1.1" 404 397 "-" "Mozilla/4.0 (compatible; MSIE 6.0; Windows 98)" 118.219.234.254 - - [19/Oct/2010:05:38:58 "GET /sqlweb/scripts/setup.php HTTP/1.1" 404 401 "-" "Mozilla/4.0 (compatible; MSIE 6.0; Windows 98)" 118.219.234.254 - - [19/Oct/2010:05:38:59 "GET /web/phpMyAdmin/scripts/setup.php HTTP/1.1" 404 408 "-" "Mozilla/4.0 (compatible; MSIE 6.0; Windows 98)" 118.219.234.254 - - [19/Oct/2010:05:38:59 "GET /web/phpmyadmin/scripts/setup.php HTTP/1.1" 404 408 "-" "Mozilla/4.0 (compatible; MSIE 6.0; Windows 98)" 118.219.234.254 - - [19/Oct/2010:05:39:00 "GET /web/scripts/setup.php HTTP/1.1" 404 400 "-" "Mozilla/4.0 (compatible; MSIE 6.0; Windows 98)" 118.219.234.254 - - [19/Oct/2010:05:39:01 "GET /webadmin/scripts/setup.php HTTP/1.1" 404 403 "-" "Mozilla/4.0 (compatible; MSIE 6.0; Windows 98)" 118.219.234.254 - - [19/Oct/2010:05:39:01 "GET /webdb/scripts/setup.php HTTP/1.1" 404 401 "-" "Mozilla/4.0 (compatible; MSIE 6.0; Windows 98)" 118.219.234.254 - - [19/Oct/2010:05:39:02 "GET /websql/scripts/setup.php HTTP/1.1" 404 401 "-" "Mozilla/4.0 (compatible; MSIE 6.0; Windows 98)" I have 2 questions 1) When such an attack happens on my site then while such scanning is going on how do I detect it? (In a very less time) 2)I have decided to rate limit the IPTABLES so as to reduce such DOS attacks by some script kiddies (to scan for vulnerabilities in phpmyadmin or some other script) to some extent.So how much should it be limited so that genuine users do not get kicked out.What is the best practise for question 2?

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• Openvz: What exactly does it mean when tcpsndbuf failcnt increases? Why must there be a minimum difference between limit and barrier?

  - by Antonis Christofides

  When the failcnt of tcpsndbuf increases, what does this mean? Does it mean the system had to go past the barrier, or past the limit? Or, maybe, that the system failed to provide enough buffers, either because it needed to go past the limit, or because it needed to go past the barrier but couldn't because other VMs were using too many resources? I understand the difference between barrier and limit only for disk space, where you can specify a grace period for which the system can exceed the barrier but not the limit. But in resources like tcpsndbuf, which have no such thing as a grace period, what is the meaning of barrier vs. limit? Why does the difference between barrier and limit in tcpsndbuf be at least 2.5KB times tcpnumsock? I could understand it if, e.g., tcpsndbuf should be at least 2.5KB times tcpnumsock (either the barrier or the limit), but why should I care about the difference between the barrier and the limit?

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• AsyncTask, RejectedExecutionException and Task Limit

  - by Samuh

  I am fetching lots of thumbnails from a remote server and displaying them in a grid view, using AsyncTask. The problem is, my grid view displays 20 thumbnails at a time, so that creates 20 AsyncTasks and starts 20 executes, one per thumbnail. I get RejectedExecution exception in my code. I recall reading somewhere that there is a limit to number of tasks that AsyncTask can have in its queue at a time, i might be hitting that. Was this bar lifted? Is there a way to increase this limit? Is it safe to just ignore this exception?(by having an empty catch(RejectedException e){} block?) I am running this code on Android 1.6 emulator and the API level in my code(minSDKVersion is 3). [EDIT: Added SDK and API level info]

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• Limit a program's execution time in C (Monte Carlo technique)

  - by rrs90

  I am working on a project which has no determined algorithm to solve using C language. I am Using Monte Carlo technique for solving that problem. And the number of random guesses I want to limit to the execution time specified by the user. This means I want to make full use of the execution time limit defined by the user (as a command line argument) to make as many random iterations as possible. Can I check the execution time elapsed so far for a loop condition. Eg: for(trials=0;execution_time P.S. I am using code blocks 10.05 for coding and GNU compiler.

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• Will be self-taught limit me?

  - by Isaiah

  I'm 21 and am pretty efficient in html/css, python, and javascript. I also know my way around lisp languages and enjoy programing in them. My problem is that I'm extremely self-taught and not quite confident that I could land a job programing, but I really need a job soon as I've just become a father. I haven't even created a resume yet because I'm not really sure what to put on it except my lone experience. So I wanted to ask, will being primarily self-taught with some experience on small projects I've done for a few clients limit me too much? I mean I know I need some kind of education so I've enrolled part time in a community college to work on a degree in computer science, but it's years till then. And if it will limit me a lot, what kind of skills would be good to work on to make my chances any better? Thank You

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• Django QuerySet filter + order_by + limit

  - by handsofaten

  So I have a Django app that processes test results, and I'm trying to find the median score for a certain assessment. I would think that this would work: e = Exam.objects.all() total = e.count() median = int(round(total / 2)) median_exam = Exam.objects.filter(assessment=assessment.id).order_by('score')[median:1] median_score = median_exam.score But it always returns an empty list. I can get the result I want with this: e = Exam.objects.all() total = e.count() median = int(round(total / 2)) exams = Exam.objects.filter(assessment=assessment.id).order_by('score') median_score = median_exam[median].score I would just prefer not to have to query the entire set of exams. I thought about just writing a raw MySQL query that looks something like: SELECT score FROM assess_exam WHERE assessment_id = 5 ORDER BY score LIMIT 690,1 But if possible, I'd like to stay within Django's ORM. Mostly, it's just bothering me that I can't seem to use order_by with a filter and a limit. Any ideas?

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• Is there Any Limit on stack memory!

  - by Vikas

  I was going through one of the threads. A program crashed because It had declared an array of 10^6 locally inside a function. Reason being given was memory allocation failure on stack leads to crash. when same array was declared globally, it worked well.(memory on heap saved it). Now for the moment ,Let us suppose, stack grows downward and heap upwards. We have: ---STACK--- ---HEAP---- Now , I believe that if there is failure in allocation on stack, it must fail on heap too. So my question is :Is there any limit on stack size? (crossing the limit caused the program to crash). Or Am I missing something?

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• PHP: Coding long-running scripts when servers impose an execution time limit

  - by thomasrutter

  FastCGI servers, for example, impose an execution time limit on PHP scripts which cannot be altered using set_time_limit() in PHP. IIS does this too I believe. I wrote an import script for a PHP application that works well under mod_php but fails under FastCGI (mod_fcgid) because the script is killed after a certain number of seconds. I don't yet know of a way of detecting what your time limit is in this case, and haven't decided how I'm going to get around it. Doing it in small chunks with redirects seems like one kludge, but how? What techniques would you use when coding a long-running task such as an import or export task, where an individual PHP script may be terminated by the server after a certain number of seconds? Please assume you're creating a portable script, so you don't necessarily know whether PHP will eventually be run under mod_php, FastCGI or IIS or whether a maximum execution time is enforced at the server level.

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• Validating the age limit using jquery

  - by Naimur

  How to check whether the entered age is between the specific limit, using Jquery in html forms

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• HLSL: Enforce Constant Register Limit at Compile Time

  - by Andrew Russell

  In HLSL, is there any way to limit the number of constant registers that the compiler uses? Specifically, if I have something like: float4 foobar[300]; In a vs_2_0 vertex shader, the compiler will merrily generate the effect with more than 256 constant registers. But a 2.0 vertex shader is only guaranteed to have access to 256 constant registers, so when I try to use the effect, it fails in an obscure and GPU-dependent way at runtime. I would much rather have it fail at compile time. This problem is especially annoying as the compiler itself allocates constant registers behind the scenes, on top of the ones I am asking for. I have to check the assembly to see if I'm over the limit. Ideally I'd like to do this in HLSL (I'm using the XNA content pipeline), but if there's a flag that can be passed to the compiler that would also be interesting.

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• php nl2br limit x amount

  - by Joshua Anderson

  Hi this is fairly simple I want to know how to use nl2br(); in php, but limit the amount of <br/>'s that are allowed at one time. //For Example: A user enters hi Im a jerk and made 16 more lines. or I could make as many as i want Is there anyway to have php limit the <br/>'s to no more than x amount of numbers at at time so if we only allowed 4 <br>'s at a time the output would be hi Im a jerk I tried to make 9 lines and it made it 4

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• Will being self-taught limit me?

  - by Isaiah

  I'm 21 and am pretty efficient in html/css, python, and javascript. I also know my way around lisp languages and enjoy programing in them. My problem is that I'm extremely self-taught and not quite confident that I could land a job programing, but I really need a job soon as I've just become a father. I haven't even created a resume yet because I'm not really sure what to put on it except my lone experience. So I wanted to ask, will being primarily self-taught with some experience on small projects I've done for a few clients limit me too much? I mean I know I need some kind of education so I've enrolled part time in a community college to work on a degree in computer science, but it's years till then. And if it will limit me a lot, what kind of skills would be good to work on to make my chances any better? Thank You

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• Python ValueError: not allowed to raise maximum limit

  - by Ricky Bobby

  I'm using python 2.7.2 on mac os 10.7.3 I'm doing a recursive algorithm in python with more than 50 000 recursion levels. I tried to increase the maximum recursion level to 1 000 000 but my python shell still exit after 18 000 recursion levels. I tried to increase the resources available : import resource resource.setrlimit(resource.RLIMIT_STACK, (2**29,-1)) sys.setrecursionlimit(10**6) and I get this error : Traceback (most recent call last): File "<pyshell#58>", line 1, in <module> resource.setrlimit(resource.RLIMIT_STACK,(2**29,-1)) ValueError: not allowed to raise maximum limit I don't know why I cannot raise the maximum limit ? thanks for your suggestions .

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• Drupal limit number of menu items in primary links

  - by ninusik

  Is there a way to set a limit on how many menu items users can add to Primary Links menu? I'm working on a Drupal site and I have a horizontal primary links nav bar. There is only room for no more than 7-8 links in the nav bar. I don't want the future maintainer of the site to add more than 8 items to the menu. Is there a way I can set a limit on that? Some module or override function? Thanks,

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• Using :limit and :order in the associated model

  - by r2b2

  Hello, Is there any way i can limit the results of an associated model? This what i was trying to do : <ul> <% account.logins.slice(0,5).sort_by(&:login_date).reverse.each do |login| -%> <li><%=h login.login_date.strftime("%d.%m.%Y")%></li> <% end -%> </ul> I'm trying to get the last five logins of the account. I cant seem to do it with account.logins(:limit=5) Thanks !

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• limit of connections with database and number of java threads in an application

  - by Jyoti

  Hi, I am working to develop a JMS application(stand alone multithreaded java application) which can receive 100 messages at a time , they need to be processed and database procedures need to be called for inserting/updating data. Procedures are very heavy as validations are also performed in them. Each procedure is taking about 30 to 50 seconds of time to execute and they are capable to run concurrently. My concern is to execute 100 procedures for all 100 messages and also send reply within time limit of 90 seconds by jms application. No application server to be used(requirement) and database is Teradata (RDBMS) I am using connection pool and thread pool in java code and testing code with 90 connections. Question is : (1) What should be the limit on number of connections with database at a time? (2) How many threads at a time are recommended? Thanks, Jyoti

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