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Re: Java + Tomcat slow on TS 109

Thank you for your reply, it was most helpful.

With cacao I am now getting much higher speeds.
The 2,3M binary data now loads in about 4-5 seconds.


On Thu, Oct 16, 2008 at 12:57 PM, Riku Voipio <riku.voipio@iki.fi> wrote:
> On Wed, Oct 15, 2008 at 11:55:08PM +0200, Vegar Neshaug wrote:
>> The QNAP TS-109 has a Marvell 5182 500MHz processor. Specifications
>> can be found here: http://www.qnap.com/pro_detail_hardware.asp?p_id=91
>> I have installed lenny versions of openjdk 6 headless and mysql.
>> Tomcat 6 was downloaded from the tomcat webpages and installed
>> locally.
>> I have a small web application which outputs image files stored as
>> blobs in the mysql database.
>> The output of the binary data is done in a loop similar to the
>> following, where "in" is the mysql binary stream and "out" is the
>> servlet outputstream.
>>                 byte[] rbuf = new byte[1024];
>>                 while ((nbytes = in.read(rbuf)) != -1) {
>>                     out.write(rbuf, 0, nbytes);
>>                 }
>> On the TS-109 this gives me speeds around 25 KB/s with "top" showing
>> the java process working at around 90-100 %.
>> For a 2,3M image this takes around 90 seconds.
>> On a 2GHz pentium 4, the same download using the same software and
>> binary data output implementation uses much less, maybe around 1
>> second.
>> What might be the reason for this difference in performance?
>> Is the java implementation on debian-arm particularly slow?
>> Is it possible to get better performance?
> You might want to try cacao-oj6-jre-headless, which is openjdk
> using cacao JIT. plain openjdk on arm is intepreted, and thus
> quite slow.
> --
> "rm -rf" only sounds scary if you don't have backups

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