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From Jan Hlavatý <hla...@code.cz>
Subject Re: java1.4.2 "rws" mode - log write performance - Linux numbers
Date Sat, 04 Sep 2004 13:07:28 GMT
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I've ran the test on my crappy Linux based Celeron 800 firewall machine.
It has RedHat linux 9.0 on single old IDE disk formatted with ext3 filesystem.

On linux, preallocated files do seem to help a lot too - theyre about 3 times faster
than growing files. Interesting thing here is that "rw"+sync() is as fasr (slow) as "rws"/"rwd"
on growing files here. "rws" on preallocated file seems to be best here, like on Windows.

I'd really like to see what numbers I'd get with different filesystems, like reiser4 -
ext3 has a reputation of being a bit slow...

Here are the numbers:


- ---------------------------------------------
1. System info:
- ---------------------------------------------

OS Platform: Linux/i386/2.4.20-20.9
  Java spec: Java Platform API Specification version 1.5 from Sun Microsystems Inc.
    Java VM: Java HotSpot(TM) Client VM version 1.5.0-rc-b63 from Sun Microsystems Inc.
  Java home: /usr/java/jdk1.5.0/jre
  Test file: /data/iotest/test.bin

Test file exists, deleting...

- ---------------------------------------------------------------------
2. Testing growing file using RandomAccessFile "rw" + .getFD().sync()
- ---------------------------------------------------------------------
       Chunk size: 4228 bytes
            Count: 10000
       Total time: 117320 ms
Writes per second: 85.237 writes/s
   Time per chunk: 11.732 ms
  Write bandwidth: 350.0KB/s

- ---------------------------------------------------------------------------
3. Testing preallocated file using RandomAccessFile "rw" + .getFD().sync()
- ---------------------------------------------------------------------------
       Chunk size: 4228 bytes
            Count: 10000
       Total time: 162398 ms
Writes per second: 61.577 writes/s
   Time per chunk: 16.24 ms
  Write bandwidth: 251.0KB/s

- ---------------------------------------------------------------------
4. Testing growing file using RandomAccessFile "rws"
- ---------------------------------------------------------------------
       Chunk size: 4228 bytes
            Count: 10000
       Total time: 118010 ms
Writes per second: 84.739 writes/s
   Time per chunk: 11.801 ms
  Write bandwidth: 346.0KB/s

- ---------------------------------------------------------------------
5. Testing preallocated file using RandomAccessFile "rws"
- ---------------------------------------------------------------------
       Chunk size: 4228 bytes
            Count: 10000
       Total time: 38827 ms
Writes per second: 257.553 writes/s
   Time per chunk: 3.883 ms
  Write bandwidth: 1.0MB/s

- ---------------------------------------------------------------------
6. Testing growing file using RandomAccessFile "rwd"
- ---------------------------------------------------------------------
       Chunk size: 4228 bytes
            Count: 10000
       Total time: 117842 ms
Writes per second: 84.859 writes/s
   Time per chunk: 11.784 ms
  Write bandwidth: 346.0KB/s

- ---------------------------------------------------------------------
7. Testing preallocated file using RandomAccessFile "rwd"
- ---------------------------------------------------------------------
       Chunk size: 4228 bytes
            Count: 10000
       Total time: 22387 ms
Writes per second: 446.688 writes/s
   Time per chunk: 2.239 ms
  Write bandwidth: 1.0MB/s

- ------------------------------------------------------------------------------
8. Testing growing file using direct buffer + FileChannel "rw" + force(true)
- ------------------------------------------------------------------------------
       Chunk size: 4228 bytes
            Count: 10000
       Total time: 116817 ms
Writes per second: 85.604 writes/s
   Time per chunk: 11.682 ms
  Write bandwidth: 350.0KB/s

- -----------------------------------------------------------------------------------
9. Testing preallocated file using direct buffer + FileChannel "rw" + force(true)
- -----------------------------------------------------------------------------------
       Chunk size: 4228 bytes
            Count: 10000
       Total time: 84007 ms
Writes per second: 119.038 writes/s
   Time per chunk: 8.401 ms
  Write bandwidth: 491.0KB/s

- ------------------------------------------------------------------------------
10. Testing growing file using direct buffer + FileChannel "rw" + force(false)
- ------------------------------------------------------------------------------
       Chunk size: 4228 bytes
            Count: 10000
       Total time: 116254 ms
Writes per second: 86.019 writes/s
   Time per chunk: 11.625 ms
  Write bandwidth: 355.0KB/s

- ------------------------------------------------------------------------------
11. Testing preallocated file using direct buffer + FileChannel "rw" + force(false)
- ------------------------------------------------------------------------------
       Chunk size: 4228 bytes
            Count: 10000
       Total time: 83028 ms
Writes per second: 120.441 writes/s
   Time per chunk: 8.303 ms
  Write bandwidth: 495.0KB/s

- ------------------------------------------------------------------------------
12. Testing growing file using direct buffer + FileChannel "rws"
- ------------------------------------------------------------------------------
       Chunk size: 4228 bytes
            Count: 10000
       Total time: 117226 ms
Writes per second: 85.305 writes/s
   Time per chunk: 11.723 ms
  Write bandwidth: 350.0KB/s

- ------------------------------------------------------------------------------
13. Testing preallocated file using direct buffer + FileChannel "rws"
- ------------------------------------------------------------------------------
       Chunk size: 4228 bytes
            Count: 10000
       Total time: 20279 ms
Writes per second: 493.121 writes/s
   Time per chunk: 2.028 ms
  Write bandwidth: 1.0MB/s

- ------------------------------------------------------------------------------
14. Testing growing file using direct buffer + FileChannel "rwd"
- ------------------------------------------------------------------------------
       Chunk size: 4228 bytes
            Count: 10000
       Total time: 117511 ms
Writes per second: 85.098 writes/s
   Time per chunk: 11.751 ms
  Write bandwidth: 350.0KB/s

- ------------------------------------------------------------------------------
15. Testing preallocated file using direct buffer + FileChannel "rwd"
- ------------------------------------------------------------------------------
       Chunk size: 4228 bytes
            Count: 10000
       Total time: 20724 ms
Writes per second: 482.532 writes/s
   Time per chunk: 2.072 ms
  Write bandwidth: 1.0MB/s

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