Hello
I'm using dlsd to log measurements. This works fine with a small amount of channels. But I want to
record 180 channels of data. As soon as I configure configure this many channels, I get into trouble
with the dlsd_logger:
May 4 14:03:02 mindclue-andy-linux dlsd_logger[9475]: ERROR: Processing data: Logger: GenSaver:
Could not write to global index file
"/media/sda8/data/dls_data/job107/channel111/chunk1241438543765428/level1/data_mean.idx": Could not
create file "/media/sda8/data/dls_data/job107/channel111/chunk1241438543765428/level1/data_mean.idx"
for appending: Too many open files
A "sudo lsof | grep dlsd | wc -l" shows me that the process dlsd has over 1000 files open at that
moment where the error message comes up.
Searching the Internet, I found out that there is a per process maximum of 1024 open files per
process by default (see http://linuxmafia.com/pub/linux/suse-linux-internals/chapter4.html).
in include/linux/fs.h there is defined:
/* Fixed constants first: */
#undef NR_OPEN
#define NR_OPEN (1024*1024) /* Absolute upper limit on fd num */
#define INR_OPEN 1024 /* Initial setting for nfile rlimits */
Where INR_OPEN seems to be this per process limit. But according to
http://linux.derkeiler.com/Newsgroups/comp.os.linux.misc/2007-09/msg02517.html
it should be possible to set the limit by using ulimit in the init script of
dlsd. So I added
ulimit -Hn 8192
in the init script, just before starting the deamon
[...]
case "$1" in
start)
echo -n "Starting DLS Daemon "
# Increase allowed nr of open files per process to 8192 (default 1024)
ulimit -Hn 8192
if ! $DLSD $DLSD_OPTIONS > /dev/null; then
exit_fail
fi
sleep 1
checkpid
exit_success
;;
[...]
But it did not change anything. The problem persists.
Does anybody have a clue how to reslove this? Do I really have to recompile the Kernel with a hacked
default? (INR_OPEN)
Regards
Andy
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email;internet:[email protected]
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