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| author | Ulrich Drepper <drepper@redhat.com> | 1998-11-25 15:42:34 +0000 |
|---|---|---|
| committer | Ulrich Drepper <drepper@redhat.com> | 1998-11-25 15:42:34 +0000 |
| commit | 0155a7737f5653e07015421b962b70fd8831c4ad (patch) | |
| tree | 48ce04644835332f6d81ed848d8ff68f6d3973c9 /FAQ | |
| parent | e66b6eca3d51457a2348d4dd23638a7b339b9e03 (diff) | |
| download | glibc-0155a7737f5653e07015421b962b70fd8831c4ad.tar.gz | |
Update.
1998-11-25 Ulrich Drepper <drepper@cygnus.com>
* version.h (VERSION): Bump to 2.0.104.
1998-11-25 Mark Kettenis <kettenis@phys.uva.nl>
* libio/bits/stdio.h (fread_unlocked): Add missing parentheses
around parameter n.
1998-11-24 Andreas Schwab <schwab@issan.cs.uni-dortmund.de>
* time/tzfile.c (__tzfile_read): Fix comment.
1998-11-24 Andreas Schwab <schwab@issan.cs.uni-dortmund.de>
* Makerules (build-shlib): Pass -O1 down to linker to get
optimized shared libraries.
1998-11-24 Andreas Schwab <schwab@issan.cs.uni-dortmund.de>
* Makeconfig ($(common-objpfx)sysd-dirs): Cope with no Subdirs
file. Strip "-" from inhibited subdir name. Combine into a
single awk program.
($(common-objpfx)sysd-sorted): Fix sed command.
Diffstat (limited to 'FAQ')
| -rw-r--r-- | FAQ | 28 |
1 files changed, 28 insertions, 0 deletions
@@ -93,6 +93,7 @@ please let me know. 2.23. I just upgraded my Linux system to glibc and now I get errors whenever I try to link any program. 2.24. When I use nscd the machine freezes. +2.25. I need lots of open files. What do I have to do? 3. Source and binary incompatibilities, and what to do about them @@ -943,6 +944,33 @@ If you need nscd, you have to use a 2.1 kernel. Note that I have at this point no information about any other platform. + +2.25. I need lots of open files. What do I have to do? + +{AJ} This is at first a kernel issue. The kernel defines limits with +OPEN_MAX the number of simultaneous open files and with FD_SETSIZE the +number of used file descriptors. You need to change these values in your +kernel and recompile the kernel so that the kernel allows to use more open +files. You don't necessarily need to recompile the GNU C library since the +only place where OPEN_MAX and FD_SETSIZE is really needed in the library +itself is the size of fd_set which is used by select. + +The GNU C library is now (nearly) select free. This means it internally has +no limits imposed by the `fd_set' type. Instead almost all places where the +functionality is needed the `poll' function is used. + +If you increase the number of file descriptors in the kernel you don't need +to recompile the C library. The remaining select calls are in the RPC code. +If your RPC daemons don't need more than FD_SETSIZE file descriptors, you +don't need to change anything at all. + +{UD} You can always get the maximum number of file descriptors a process is +allowed to have open at any time using + + number = sysconf (_SC_OPEN_MAX); + +This will work even if the kernel limits change. + . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |