Performance Problem!

YingchunH

Hi everyone,
I've got a performance problem with ice. I used TCP connection to transfer my data which may be 0-100 MB in size. It is too slow via network(WinXP SP2, 100M LAN, It will take about 35 seconds To transfer 9MB data ).

I found that ICE runtime devided the data into packet of 64k in size on WIN32 platform. Here is the related source code of ICE runtime:

IceInternal::TcpTransceiver::Write(Buffer& buf, int timeout)
{
Buffer::Container::difference_type packsize =
static_cast<Buffer::Container::difference_type>(buf.end() - buf.i);

#ifdef _WIN32
//limit packet size to avoid performance problems on WIN32
if(packetsize > 64 * 1024)
{
packetsize = 64 * 1024;
}
#endif
...
...
}

I belive that too much network I/O times will cause this performance problem.
Is 64K the best value? Is there other ways to improve data transfer performance if I don't wanna modify these codes and recompile them?

Thanks very much.

YingchunH

YingchunH

P.S. ICE version 2.1.0

xdm

perfomance

Hi YingchunH

I using Ice for seding large amounts of data in winXp2 and i never have perfomance issue.

I my case perfomance is always limit for the speed that my computer can marshall data in an Ice::Byte never for network.

Have you tested your code in other OS?

YingchunH

Hi xdm,
Thanks for your quick response.
I masked off those codes and recompiled, now it is much faster(20 times above) than before.
I 've not tested my code in other OSs yet, and I think this problem won't happened on other platforms cause the code is just for windows.
I used string (other than sequence<byte>) to marshall byte data and got no performance question.


thank you.

YingchunH

benoit

Thanks for the report, we'll look into this!

Benoit.