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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 SUNOS

havedisk

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 utilization.

       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 5.10							    30 Dec 1996 						       rstat(3RPC)
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