Performance of javamail

[sem]

I wrote a simple program that sends emails. The issue is that it takes about a second to process Transport.send(message). My network is OK and I may send at least 5 messages per second using mail command. Is this expected behaviour? Can I set any settings to speed it up?

 

[sedj]

Seems normal to me ...

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[sem]

What does seem normal? 1 message per second or your performance that differs from mine?

Regards, Dima

http://seminihin.narod.ru

 

[sedj]

The mail programme is written in C, and is vastly different to the javax.mail API - so I would expect it to be quicker.

You asked if taking 1 second for the javax.mail API was, and I quote, expected behaviour. Well, I'm answering that question - yes, I think that is normal.

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[sem]

Is there any way to improve performance? Create multiple threads or launch multiple vm's or anything else? I mean that send is static method.
I hoped that I've missed some delay parameter

Regards, Dima

http://seminihin.narod.ru

 

[sedj]

You could try caching the Session instance that you use if not already.

I would wrap the "send mail" call in a Thread though - that way I think you'll get nearer the performance you require.

Obviously, starting the JVM with a higher heap level using the -Xms -Xmx switches will help too.

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[sem]

SMTP is quite simple protocol so I wonder how a higher heap may help in sending 100 bytes via TCP/IP? I think that professional typist may achive the same speed with telnet
As for the thread advice - thank you, I'll give it a try as my Session instance is already the same and the whole second (and even more!) is utilized by Transport.send() only.

Regards, Dima

http://seminihin.narod.ru

 

[sedj]

Increasing the heap size may not help - but remember that its not just 100 bytes of memory you are using, but all the object instantiation etc. The JVM by default only starts up with 16Mb, so if you are doing multithreading, its always a good idea to increase the heap size - you never know !

Another daft idea could be using Runtime.exec() to run the native "mail" command - it may be quicker !!!

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