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Full Discussion: AIX - io info get from "libperfstat" not match "iostat"
Top Forums UNIX for Advanced & Expert Users AIX - io info get from "libperfstat" not match "iostat" Post 302903678 by jackliang on Thursday 29th of May 2014 01:35:21 AM
Old 05-29-2014
AIX - io info get from "libperfstat" not match "iostat"
Hi, everyone.
I need to write a program to get io info based on libperfstat.
But the "write time" of a disk is just half of the value get from iostat.
I'm confused and can't explain. Help please.

How I calculate "write service time per sec":

In iostat:
Code:
 
        write service time per sec = wps * avgserv
        wps: write requests per sec
        avgserv: avg service time per write request

In my program:
Code:
        (new wserv - old wserv) / intervalTime

iostat cmd:
Code:
 iostat -D hdisk1 10

My C code :
Code:
    int i, ret, tot;
    perfstat_disk_t *statp;
    perfstat_id_t first;
    
    unsigned long long oldValue = 0;
    unsigned long long newValue = 0;
    int interval = 10;
    
    while (true) {
        /* check how many perfstat_disk_t structures are available */
        tot =  perfstat_disk(NULL, NULL, sizeof(perfstat_disk_t), 0);
    
        /* allocate enough memory for all the structures */
        statp = calloc(tot, sizeof(perfstat_disk_t));
    
        /* set name to first interface */
        strcpy(first.name, FIRST_DISK);
    
        /* ask to get all the structures available in one call */
        /* return code is number of structures returned */
        ret = perfstat_disk(&first, statp,
            sizeof(perfstat_disk_t), tot);
    
        /* print statistics for each of the disks */
        for (i = 0; i < ret; i++) {
            if (strcmp(statp[i].name, "hdisk1") == 0) {
                printf("\nStatistics for disk : %s\n", statp[i].name);
                printf("-------------------\n");
                newValue = statp[i].wserv;
                printf("write time : %llu /s\n", (newValue - oldValue)/interval);
                oldValue = newValue;
            }
        }
    
        sleep(interval); // sleep 10s
    }

 

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LEARN ABOUT OPENSOLARIS

rstat

rstat(3RPC)						       RPC Library Functions						       rstat(3RPC)

NAME

       rstat, havedisk - get performance data from remote kernel

SYNOPSIS

       cc [ flag ... ] file ... -lrpcsvc [ library ... ]
       #include <rpc/rpc.h>
       #include <rpcsvc/rstat.h>

       enum clnt_stat rstat(char *host, struct statstime *statp);

       int havedisk(char *host);

PROTOCOL

       /usr/include/rpcsvc/rstat.x

DESCRIPTION

       These  routines require that the rpc.rstatd(1M) daemon be configured and available on the remote system indicated by host. The rstat() pro-
       tocol is used to gather statistics from remote kernel.  Statistics will be available on items such as paging, swapping,	and  cpu  utiliza-
       tion.

       rstat() fills in the statstime structure statp for host.  statp must point to an allocated statstime structure. rstat() returns RPC_SUCCESS
       if it was successful; otherwise a enum clnt_stat is returned which can be displayed using clnt_perrno(3NSL).

       havedisk() returns 1 if host has disk, 0 if it does not, and -1 if this cannot be determined.

       The following XDR routines are available in librpcsvc:

	 xdr_statstime
	 xdr_statsvar

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |MT-Level		     |MT-Safe			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       rup(1), rpc.rstatd(1M), rpc_clnt_calls(3NSL), attributes(5)

SunOS 5.11							    30 Dec 1996 						       rstat(3RPC)
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