Hello Mulari, PVFS2 users
I tried to compile the io program you provided but the compiling failed with
the errors (below). I tried to run another test perf (the program perf.c
found under romio directory) and compared NFS with PVFS2, here are the
results (for 7 processes)
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?
Many thanks,
nasr
---------------------------------------------------------------------------------------------------------------------------------------
io.c program error
# /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;
^
io.c(53): remark #1419: external declaration in primary source file
int parse_args(int argc, char **argv);
^
io.c(54): remark #1419: external declaration in primary source file
double Wtime(void);
^
io.c(57): remark #1419: external declaration in primary source file
extern char *optarg;
^
io.c(58): remark #1419: external declaration in primary source file
extern int optind, opterr;
^
io.c(58): remark #1419: external declaration in primary source file
extern int optind, opterr;
^
compilation aborted for io.c (code 2)
-------------------------------------------------------------------------------------------------------------------------------------------
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