[Darshan-users] fputs and internal glibc i/o calls

[Chuck Cranor]

On Thu, Apr 03, 2014 at 05:56:29PM +0000, Harms, Kevin N. wrote:
> > h0:/tmp/ctime# strace ./a.out |& fgrep localtime
> > open("/etc/localtime", O_RDONLY|O_CLOEXEC) = 4
> > h0:/tmp/ctime# 
> 
>   Darshan filters out anything in /etc. There's a list of filters in:
>   https://trac.mcs.anl.gov/projects/darshan/browser/trunk/darshan-runtime/lib/darshan-posix.c#L132
> 
>   I don't know if you remove /etc that /etc/localtime will show up, but I suggest testing.

hi kevin-


    ooops!   i made a copy of a non-default zonefile and copied it to 
my home directory and used the TZ environment variable to change
the default location from /etc/localtime to /users/chuck/localtime
to avoid the filter in darshan-posix.c.

I repeated the experiment with the same results (you can tell when
the TZ is set because the time is offset by 2 hours, as shown below):

h0:/tmp/ctime# ./a.out 
time=Thu Apr  3 12:31:12 2014
h0:/tmp/ctime# 

h0:/tmp/ctime# env TZ=/users/chuck/localtime ./a.out
time=Thu Apr  3 14:31:21 2014
h0:/tmp/ctime# 

h0:/tmp/ctime# env TZ=/users/chuck/localtime strace ./a.out | & fgrep localtime
open("/users/chuck/localtime", O_RDONLY|O_CLOEXEC) = 4
h0:/tmp/ctime# 

h0:/tmp/ctime# env TZ=/users/chuck/localtime LD_PRELOAD=/usr/local/lib/libdarshan.so mpirun.mpich2 ./a.out
time=Thu Apr  3 14:31:41 2014
h0:/tmp/ctime# 

h0:/tmp/ctime# darshan-parser /m/pvfs/tmp/2014/4/3/root_a.out_id22948_4-3-52301-2886565163687760448_1.darshan.gz 
# darshan log version: 2.02
# size of file statistics: 1328 bytes
# size of job statistics: 120 bytes
# exe: ./a.out
# uid: 0
# jobid: 22948
# start_time: 1396549901
# start_time_asci: Thu Apr  3 12:31:41 2014
# end_time: 1396549901
# end_time_asci: Thu Apr  3 12:31:41 2014
# nprocs: 1
# run time: 1
# metadata: lib_ver = 2.2.8
# metadata: h = romio_no_indep_rw=true;cb_nodes=4

# mounted file systems (device, mount point, and fs type)
# -------------------------------------------------------
# mount entry: 8879946760550363901      /m/pvfs fuse
# mount entry: -6525176383006974612     /l0     ext2
# mount entry: 1378004016996341907      /users/garth    nfs
# mount entry: -6395289464566466203     /users/qingzhen nfs
# mount entry: 3967925232003708285      /proj/TableFS   nfs
# mount entry: -5933552100018119666     /users/chuck    nfs
# mount entry: -9071479661283960111     /share  nfs
# mount entry: 361011049498856045       /users/kair     nfs
# mount entry: 3179183617035706161      /dev    devtmpfs
# mount entry: -648807988769344735      /       ext3
# no files opened.
h0:/tmp/ctime# 
h0:/tmp/ctime# 



chuck