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TDS is reporting too many open files
The Thredds data server is reporting too many opened files when many users are accessing concurrently to the opendap service.
This is happenning with the ECOMS data gateway which is publishing virtual datasets (NcML) aggregating a huge number of files. For example, the System4 vistual datasets are a collection of 135k of GRIB files and therefore the potential amount of files for this datasets is 3x the amount files (405k files)
To avoid this the limit on opened files must be increased.
The current limits for a session can be checked as:
[user@oceano ~]# ulimit -Hn 16384 [user@oceano ~]# ulimit -Sn 16384
and for a process the PID is required. For example:
[user@oceano ~]# cat /proc/10051/limits Limit Soft Limit Hard Limit Units Max cpu time unlimited unlimited seconds Max file size unlimited unlimited bytes Max data size unlimited unlimited bytes Max stack size 10485760 unlimited bytes Max core file size 0 unlimited bytes Max resident set unlimited unlimited bytes Max processes 191823 191823 processes Max open files 16384 16384 files Max locked memory 32768 32768 bytes Max address space unlimited unlimited bytes Max file locks unlimited unlimited locks Max pending signals 191823 191823 signals Max msgqueue size 819200 819200 bytes Max nice priority 0 0 Max realtime priority 0 0
To increase the limit have to edit the security limits for the user:
[root@oceano ~]# nano /etc/security/limits.conf
and write down the hard and soft limits. For example:
user soft nofile 100000 user hard nofile 100000
be sure that system wide limits are also increased:
cat /proc/sys/fs/file-max
or that you can edit sysctl properties and reload them:
[root@oceano ~]# nano /etc/sysctl.conf
adding this line
fs.file-max = 500000
and reload the new propertie value:
[root@oceano ~]# sysctl -p ...
and check that the new value is update:
[root@oceano ~]# cat /proc/sys/fs/file-max 500000
and for the user limits the user needs to start a new session a check the new limits:
[user@oceano ~]# ulimit -Hn 100000 [user@oceano ~]# ulimit -Sn 100000
and also we can check that processes use the same limits
[user@oceano TDS5]$ cat /proc/32090/limits Limit Soft Limit Hard Limit Units Max cpu time unlimited unlimited seconds Max file size unlimited unlimited bytes Max data size unlimited unlimited bytes Max stack size 10485760 unlimited bytes Max core file size 0 unlimited bytes Max resident set unlimited unlimited bytes Max processes 191823 191823 processes Max open files 1000000 1000000 files Max locked memory 32768 32768 bytes Max address space unlimited unlimited bytes Max file locks unlimited unlimited locks Max pending signals 191823 191823 signals Max msgqueue size 819200 819200 bytes Max nice priority 0 0 Max realtime priority 0 0
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