Here is a dtrace script based of one of the examples for the nfs provider.
Especially useful when you use NFS for ESX or other hypervisors.
Andreas
#!/usr/sbin/dtrace -s
#pragma D option quiet
inline int TOP_FILES = 50;
dtrace:::BEGIN
{
printf("Tracing... Hit Ctrl-C to end.\n");
startscript = timestamp;
}
nfsv3:::op-read-start,
nfsv3:::op-write-start
{
start[args[1]->noi_xid] = timestamp;
size[args[1]->noi_xid] = args[2]->count;
}
nfsv3:::op-read-done,
nfsv3:::op-write-done
/start[args[1]->noi_xid] != 0/
{
this->elapsed = timestamp - start[args[1]->noi_xid];
this->size = size[args[1]->noi_xid];
@rw[probename == "op-read-done" ? "read" : "write"] =
quantize(this->elapsed / 1000);
@host[args[0]->ci_remote] = sum(this->elapsed);
@file[args[1]->noi_curpath] = sum(this->elapsed);
@rwsc[probename == "op-read-done" ? "read" : "write"] = count();
@rws[probename == "op-read-done" ? "read" : "write"] =
quantize(this->size);
/* @rwsl[probename == "op-read-done" ? "read" : "write"] =
lquantize(this->size,4096,8256,64);
*/ @hosts[args[0]->ci_remote] = sum(this->size);
@files[args[1]->noi_curpath] = sum(this->size);
this->size = 0;
size[args[1]->noi_xid] = 0;
start[args[1]->noi_xid] = 0;
}
dtrace:::END
{
this->seconds = (timestamp - startscript)/1000000000;
printf("\nNFSv3 read/write top %d files (total us):\n", TOP_FILES);
normalize(@file, 1000);
trunc(@file, TOP_FILES);
printa(@file);
printf("NFSv3 read/write distributions (us):\n");
printa(@rw);
printf("\nNFSv3 read/write top %d files (total MByte):\n", TOP_FILES);
normalize(@files, 1024*1024);
trunc(@files, TOP_FILES);
printa(@files);
printf("\nNFSv3 read/write by host (total ns):\n");
printa(@host);
printf("\nNFSv3 read/write by host (total s):\n");
normalize(@host, 1000000000);
printa(@host);
printf("\nNFSv3 read/write by host (total Byte):\n");
printa(@hosts);
printf("\nNFSv3 read/write by host (total kByte):\n");
normalize(@hosts,1024);
printa(@hosts);
denormalize(@hosts);
printf("\nNFSv3 read/write by host (total kByte/s):\n");
normalize(@hosts,this->seconds*1024);
printa(@hosts);
printf("NFSv3 read/write distributions (Byte):\n");
printa(@rws);
/* printf("NFSv3 read/write distributions (Byte):\n");
printa(@rwsl);
*/
printf("NFSv3 read/write counts:\n");
printa(@rwsc);
printf("\nScript running for %20d seconds ",this->seconds);
}
--
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