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Re: file handle limitation of 255

by cdarke (Prior)
on Jul 15, 2010 at 08:20 UTC ( #849726=note: print w/ replies, xml ) Need Help??


in reply to file handle limitation of 255

I had this problem a few years ago - though it is rare. My limit was more like 20 file descriptors, rather than 255. I was writing supporting code for an app. which was ported from a mainframe, and a redesign was not an option.

The limit is associated with the process, so what I did was to spawn 'worker' processes to do the IO for me, and some of the processing. Essentially I split the task, with a management process which co-ordiinated everything. It was a redesign for my part of the app., but it worked very well and was scalable. Eventually I extended it to allow local processing and IO on different machines (communication used INET sockets).

So, to beat a limitation of a single process, just create more!


Comment on Re: file handle limitation of 255
Re^2: file handle limitation of 255
by radnus (Novice) on Jul 15, 2010 at 16:28 UTC

    This problem of 255 limit is independent of ulimit. I set this on /etc/system :- set rlim_fd_max=65536 set rlim_fd_cur=65536 So that I get host# ulimit -n 65536 But still I have 255 limitation.

      A workaround on Solaris 10 (update 4?) and later is to run the application with this environment variable setting:
      LD_PRELOAD_32=/usr/lib/extendedFILE.so.1
      For details, see http://blogs.sun.com/mandalika/entry/solaris_workaround_to_stdio_s

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