hyperic-hq-discuss

[Hyperic-hq-discuss] Getting Disk read bytes stat

[Gerry E. <ger...@gm...>]

Hello.

I am trying to retrieve the number of disk read bytes at any one time with SIGAR and I'm having some unusual results. when I run this code: 

Sigar sigar = new Sigar();

 org.hyperic.sigar.DiskUsage infos = sigar.getDiskUsage("D:\\");

long read = infos.getReadBytes();

I get a very big number that is not representative of the disk usage. Can anyone suggest what I'm doing wrong? I'd be very pleased! 

the numbers coming back are in the region of: 
628467
629786
629514

Re: [Hyperic-hq-discuss] Getting Disk read bytes stat

[Doug M. <do...@hy...>]

Hi,

ReadBytes is a counter, so you'll need to compare the difference over time.  For example:
        Sigar sigar = new Sigar();

        long prevTime = 0;
        long prevBytes = 0;
        final long interval = 1 * 1000;

        while (true) {
            long time = System.currentTimeMillis();
            long bytes = sigar.getDiskUsage("D:").getReadBytes();
            if (prevTime != 0) {
                long rate = (bytes - prevBytes) / ((time - prevTime) / interval);
                System.out.println("disk read bytes per second=" + Sigar.formatSize(rate));
            }
            prevTime = time;
            prevBytes = bytes;
            Thread.sleep(interval);
        }