Fork Error 0 Solaris
Expert Users Expert-to-Expert. Learn advanced UNIX, UNIX commands, Linux, Operating Systems, System Administration, Programming, Shell, Shell Scripts, Solaris, Linux, HP-UX, AIX, OS X, BSD. Search Forums Show Threads Show Posts Tag Search Advanced Search Unanswered Threads Find All Thanked solaris error: fork: resource temporarily unavailable Posts Go to Page... linux operating commands and unix operating commands Problem due to Fork segkpsize Error UNIX for Advanced & Expert Users Tags unix commands Page 1 of 2 1 2 > Thread fork not enough space solaris 11 Tools Search this Thread Display Modes #1 07-03-2008 Amey Joshi Registered User Join Date: Oct 2007 Last Activity: 12 September 2014, 11:40 AM EDT Posts: 65 Thanks: 0 Thanked 0 Times in 0 Posts Problem cannot fork resource temporarily unavailable due to Fork Error Hi, I have developed a datastage job...which has many process running in parallel..but because of Fork Error my job is not working Can any body help me out to solve this Fork error problem. My Os is SUNOS. IS there any setting in Unix through admin where in if i set some paramter my process will get atomatically killed when specific duration has elapsed... Thanks in Advance!! Remove advertisements Sponsored Links Amey Joshi View Public Profile Find all posts by Amey Joshi #2 07-03-2008 matrixmadhan Technorati Master Join Date: Mar 2005 Last Activity: 3 October 2016, 6:30 AM EDT Location: classification algos Posts: 3,206 Thanks: 19 Thanked 30 Times in 27 Posts there are two approaches to this. 1) set a timer in the child - which generates SIGALRM after specified 'n' units of time, register handler for that signal and in the handler, it should terminate itself 2) have a controller program which takes care of creating new process on need, monitoring them and if it lives more than the threshold trigger it with a signal and accordingly in the child register handler for that signal and it should terminate. Both the methods are doable, and you will have more control with the second approach, as number of child to be spawned, time for which child should live everything can be configured in the invoker process Remove advertisements Sponsored Links matrixmadhan View Public Profile Find all posts by matrixmadhan #3 07-07-2008 Amey Joshi Registered User Join Date: Oct 2007 Last Activity: 12 September 2014, 11:40 AM EDT Posts: 65 Thanks: 0 Thanked 0 Times in 0 Posts Quote: Originally Posted by matrixmadhan there are two approaches to this. 1) set a timer in the child - which generates SIGALRM after specified 'n' units of time, register handler for that signal and in the handler, it sho
So, we had a problem where, every now and then, a sudden rush of requests to our webserver would lead to apache saying “fork: Unable to fork new process” in the error logs, once it tried to spawn more than ~ 400 httpds – and for a little while no-one got any webbage. I spent some time looking into why this should be, and never really got anywhere. In each case, a hard restart of apache would fix it. I could see that there was a problem with our apache; it starts out life at ~8MB per httpd process, but after a few months of running (with lots http://www.unix.com/unix-for-advanced-and-expert-users/71982-problem-due-fork-error.html of “apachectl graceful”’s, but no restarts) would be more like 100MB. But, looking into the process, almost all of that was shared memory: # pmap -ax 4987 4987: /opt/coolstack/apache2/bin/httpd -k start Address Kbytes RSS Anon Locked Mode Mapped File 0803F000 36 36 12 - rwx-- [ stack ] 08050000 320 312 - - r-x-- httpd 080AF000 12 12 8 - rwx-- httpd 080B2000 4 4 4 - rwx-- httpd 080B3000 116456 116324 104 - rwx-- [ http://blogs.warwick.ac.uk/chrismay/entry/apache_fork_unable/ heap ] FDFA0000 184 184 16 - rw-s- [ anon ] FE000000 504 184 - - rw-s- [ anon ] FE080000 64 16 - - rwx-- [ anon ] FE0A0000 24 24 - - r-x-- mod_proxy_http.so ... other inconsequential items... -------- ------- ------- ------- ------- total Kb 124144 121736 220 - so this shouldn’t matter. Even if there were 1000 httpds, with an anonymous allocation of 220K each, that isn’t going to make a dent on our server, which has about 50GB of VM in total. Additionally, Solaris maintains a cache for ZFS file systems, which will, by default use up almost all of the RAM on the box. However, the cache allocations are special; a call to fork() or malloc() is allowed to eat into cache memory whenever it needs to. But I could see on our box that the ZFS cache was sat at about 20GB – so if ZFS is still using all this RAM, why can’t apache? Well, predictably enough, my failure to analyse the problem came back to bite us. One day, instead of just apache being unable to fork, the whole box locked up. I couldn’t even run ‘ps’ to find a pid to kill. So, we transferred the service as quickly as possible onto a standby box, and left the wedged server to itself. Clearly, a deeper
int to https://docs.oracle.com/cd/E19455-01/806-1075/msgs-1980/index.html intNext: Restartable system callResource temporarily unavailable Cause This error indicates that the fork(2) system call failed because the system's process table is full, or that a system call failed because of insufficient memory resource temporarily or swap space. Also, a user might not be allowed to create more processes. Action Simply waiting often gives the system time to free resources. However, if this message occurs often on resource temporarily unavailable a system, reconfigure the kernel and allow more processes. To increase the size of the process table, increase the value of MAXUSERS in the /etc/system file. The default MAXUSERS value is the amount of main memory in Mbytes, minus 2. If one user is not allowed to create any more processes, that user has probably exceeded the memory size limit; see the limit(1) man page for details. Technical Notes The symbolic name for this error is EAGAIN, errno=11. Previous: Reset tty pgrp from int to intNext: Restartable system call © 2010, Oracle Corporation and/or its affiliates