Hi,
+-From: derek cram <cram.de...@gmail.com> --
|_Date: Tue, 9 Aug 2011 08:52:46 +0200 _____
|
|I've made more tests and I can notice a small improvement. It downloads at
|3.5MB/s instead of 3.0Mb/s.
I have been running some simple tests for checking download performances on
Java6 + GNU/Linux system. Here are results,
* downloading 20MB file through the slow network(across WAN),
* jsch-0.1.44: 0.7346629MB/s
* jsch-0.1.45-rc6: 5.480023MB/s
* sftp(OpenSSH_4.3p2): 1.7MB/s
* downloading 20MB file from the host on LAN,
* jsch-0.1.44: 12.193116MB/s
* jsch-0.1.45-rc6: 18.736536MB/s
* sftp(OpenSSH_4.3p2): 22.6MB/s
Is it amazing that downloading performance with 0.1.45-rc6 is faster than
with sftp command on the slow network?
As for code, I have just replaced some lines in Sftp.java[1] with the
followings,
long totaltime=0;
int count = 10;
for(int j=0; j<count; j++){
long t=System.currentTimeMillis();
c.get(p1, p1);
long tt=System.currentTimeMillis();
System.out.println(" "+(tt-t));
totaltime+=(tt-t);
}
long filesize = (new java.io.File(p1)).length() / 1024;
System.out.println("downloading "+filesize+"KB*"+count+
" in "+totaltime+"msec -> "+
(filesize*count)/((float)(totaltime))+"MB/s");
|Is it such improvement expected? Or is it more? I thought it could be the
|same as upload so 16MB/s.
It will depend on your network, environment and your testing code,
and I have nothing to say about, at present.
[1] http://www.jcraft.com/jsch/examples/Sftp.java
Sincerely,
--
Atsuhiko Yamanaka
JCraft,Inc.
1-14-20 HONCHO AOBA-KU,
SENDAI, MIYAGI 980-0014 Japan.
Tel +81-22-723-2150
+1-415-578-3454
Skype callto://jcraft/
Twitter: http://twitter.com/ymnk
Facebook: http://facebook.com/aymnk
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