Hi Lou
It is hard to say without knowing more details.
Can you post the exact iperf command you used?
Also the Crail code you show seems not to be the one you
use for the measurements, at least I don't see where the code
computes the bandwidth. Can you post the actual code you are using?
Have you configured Crail to store data on hugepages? Or will
it access disks?
There is also iobench, a performance measurement tool that comes
with Crail. Have you tried measuring with this one?
Best
Adrian
On 3/5/20 14:01, Lou DeGenaro wrote:
> Hello,
>
> I'm comparing Crail to iperf. VM-A is used to run the server(s). VM-B is
> used to run the client. Both VMs are CentOS 7 with 8 GB memory + 2 CPUs.
> Tests runs are non-overlapping.
>
> For the Crail case , a 1 GB file is posted to server and a simple Java
> client is employed (see below).
>
> Results:
>
> iperf: 4.05 Gb/seb
> Crail: 2.52 Gb/sec
>
> Why is iperf so much better??
>
> Lou.
>
> -----
>
> Crail Java Client:
>
> public static void main(String[] args) {
> try {
> //initialize
> String filename = "/G1.txt";
> int filesize = 1024*1024*1024;
> int bufsize = 1024*1024;
> CrailBuffer buf = OffHeapBuffer.wrap(ByteBuffer.allocateDirect(bufsize));
> CrailConfiguration cconf = CrailConfiguration.createConfigurationFromFile();
> CrailStore cstore = CrailStore.newInstance(cconf);
> CrailFile file = cstore.lookup(filename).get().asFile();
> CrailInputStream directStream =
> file.getDirectInputStream(file.getCapacity());
> long sumbytes = 0;
> //run test
> long start = System.currentTimeMillis();
> while (sumbytes < filesize) {
> buf.clear();
> CrailResult cr = directStream.read(buf).get();
> long ret = cr.getLen();
> sumbytes = sumbytes + ret;
> }
> long end = System.currentTimeMillis();
> //print result and clean-up
> double executionTime = ((double) (end - start)) / 1000.0;
> System.out.println("time: "+executionTime);
> cstore.close();
> directStream.close();
> }
> catch(Exception e) {
> e.printStackTrace();
> }
> }
>
--
Adrian Schüpbach, Dr. sc. ETH Zürich
