Hi Nasr, > # /opt/mpich1/intel/bin/mpicc io.c -g -Wall -o io > > io.c(49): error: identifier "O_LARGEFILE" is undefined > int amode = O_RDWR | O_CREAT | O_LARGEFILE; > ^ > compilation aborted for io.c (code 2)
Can you do mpicc -D_FILE_OFFSET_BITS=64 -D_LARGEFILE64_SOURCE io.c -g -Wall -o io and see if that fixes the build issue? > NFS: > ----- > > Access size per process = 67108864 bytes, ntimes = 5 > Write bandwidth without file sync = 70.134351 Mbytes/sec > Read bandwidth without prior file sync = 79.210288 Mbytes/sec > Write bandwidth including file sync = 71.789752 Mbytes/sec > Read bandwidth after file sync = 80.471737 Mbytes/sec > > PVFS2 > -------- > Access size per process = 67108864 bytes, ntimes = 5 > Write bandwidth without file sync = 329.618503 Mbytes/sec > Read bandwidth without prior file sync = 321.839774 Mbytes/sec > Write bandwidth including file sync = 121.779536 Mbytes/sec > Read bandwidth after file sync = 320.428229 Mbytes/sec > > I did the test after tuning TCP using netpipe benchmark. I can see there is > a big gap between write and read with sync in pvfs2 as compared to NFS (121, > 320 compared to 71, 80). Why? As Dean mentioned this is due to PVFS2 not syncing data to disk by default. Regardless, these numbers do look good on your setup :) thanks! Murali > > Many thanks, > nasr > > --------------------------------------------------------------------------------------------------------------------------------------- > > ------------------------------------------------------------------------------------------------------------------------------------------- > > _________________________________________________________________ > Find love online with MSN Personals. > http://match.msn.com.my/match/mt.cfm?pg=channel > > _______________________________________________ Pvfs2-users mailing list [email protected] http://www.beowulf-underground.org/mailman/listinfo/pvfs2-users
