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Any way to boost JVM Startup Speed?

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It is said that Java is 10x faster than python in terms of performance. That's what I see from benchmarks too. But what really brings down Java is the JVM startup time.

This is a test I made:

$time xlsx2csv.py Types\ of\ ESI\ v2.doc-emb-Package-9
...
<output skipped>
real    0m0.085s
user    0m0.072s
sys     0m0.013s


$time java  -jar -client /usr/local/bin/tika-app-0.7.jar -m Types\ of\ ESI\ v2.doc-emb-Package-9

real    0m2.055s
user    0m2.433s
sys     0m0.078s

Same file , a 12 KB ms XLSX embedded file inside Docx and Python is 25x faster !! WTH!!

It takes 2.055 sec for Java.

I know it is all due to startup time, but what i need is i need to call it via a script to parse some documents which i do not want to re-invent the wheel in python.

But as to parse 10k+ files , it is just not practical..

Anyway to speed it up (I already tried -client option and it only speed up by so little(20%) ).

My another idea? Run it as a long-running daemon , communicate using UDP or Linux-ICP sockets locally?

like image 357
Phyo Arkar Lwin Avatar asked Oct 29 '10 22:10

Phyo Arkar Lwin

People also ask

Why is JVM startup slow?

2.1 Possible Causes for Slow JVM Startup An application might seem slow when it starts because, The application might be waiting to import files. A large number of methods might have to be compiled. There might be a problem in code optimization (especially on single-CPU machines).

How can I speed up Java Runtime?

You can improve performance by increasing your heap size or using a different garbage collector. In general, for long-running server applications, use the Java SE throughput collector on machines with multiple processors ( -XX:+AggressiveHeap ) and as large a heap as you can fit in the free memory of your machine.

What is JVM warmup?

JVM warm-up effectWhen a JVM based app is launched, the first requests it receives are generally significantly slower than the average response time. This warm-up effect is usually due to class loading and bytecode interpretation at startup. After 10k iterations, the main code path is compiled and “hot”.

How do I start JVM?

The way to start a jvm is by invoking the main, either by invoking a jar using java -jar MyJar or by simply running main class from an IDE. Yes, Multiple jvm instances can be run on a single machine, they all will have their own memory allocated. There will be that many jvms as many main programs you run.

1 Answers

Try Nailgun.

Note: I don't use it personally.

like image 191
Zan Lynx Avatar answered Oct 05 '22 16:10

Zan Lynx
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