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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 LINUX

irsend

IRSEND(1)							   User Commands							 IRSEND(1)

NAME

       irsend - basic LIRC program to send infra-red commands

SYNOPSIS

       irsend [options] DIRECTIVE REMOTE CODE [CODE...]

DESCRIPTION

       Asks the lircd daemon to send one or more CIR (Consumer Infra-Red) commands. This is intended for remote control of electronic devices such
       as TV boxes, HiFi sets, etc.

       DIRECTIVE can be:
	  SEND_ONCE	    - send CODE [CODE ...] once
	  SEND_START	    - start repeating CODE
	  SEND_STOP	    - stop repeating CODE
	  LIST		    - list configured remote items
	  SET_TRANSMITTERS  - set transmitters NUM [NUM ...]
	  SIMULATE	    - simulate IR event

       REMOTE is the name of a remote, as described in the lircd configuration file.

       CODE is the name of a remote control key of REMOTE, as it appears in the lircd configuration file.

       NUM is the transmitter number of the hardware device.

       For the LIST DIRECTIVE, REMOTE and/or CODE can be empty:

	  LIST	 ""    ""   - list all configured remote names
	  LIST REMOTE  ""   - list all codes of REMOTE
	  LIST REMOTE CODE  - list only CODE of REMOTE

       The SIMULATE command only works if it has been explicitly enabled in lircd.

       -h --help
	      display usage summary

       -v --version
	      display version

       -d --device
	      use given lircd socket [/var/run/lirc/lircd]

       -a --address=host[:port]
	      connect to lircd at this address

       -# --count=n
	      send command n times

EXAMPLES

	  irsend LIST DenonTuner ""
	  irsend SEND_ONCE  DenonTuner PROG-SCAN
	  irsend SEND_ONCE  OnkyoAmpli VOL-UP VOL-UP VOL-UP VOL-UP
	  irsend SEND_START OnkyoAmpli VOL-DOWN ; sleep 3
	  irsend SEND_STOP  OnkyoAmpli VOL-DOWN
	  irsend SET_TRANSMITTERS 1
	  irsend SET_TRANSMITTERS 1 3 4
	  irsend SIMULATE "0000000000000476 00 OK TECHNISAT_ST3004S"

FILES

       /etc/lirc/lircd.conf
	      Default lircd configuration file.  It should contain all the remotes, their infra-red codes and the corresponding timing	and  wave-
	      form details.

DIAGNOSTICS

       If lircd is not running (or /var/run/lirc/lircd lacks write permissions) irsend aborts with the following diagnostics:
       "irsend: could not connect to socket"
       "irsend: Connection refused" (or "Permission denied").

SEE ALSO

       The documentation for lirc is maintained as html pages. They are located under html/ in the documentation directory.

       lircd(8), mode2(1), smode2(1), xmode2(1), irrecord(1), irw(1), http://www.lirc.org.

irsend 0.9.0-pre1						   October 2010 							 IRSEND(1)
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