Linux
ILE
PASE
Computational Environment
0
0.2
0.4
0.6
0.8
1
1.2
Relative Performance (Bigger Better)
Integer
Floating
Point
Fraction of ILE Performance
One virtue of the i870, i890, and i825 machines is that the hardware floating point unit can make up for
some of the code generation deficit due to its superior hardware scheduling capabilities.
Computational Performance -- Java
Generally, Java computational performance will be dictated by the quality of the JVM used. Gcc
performance considerations don't apply (occasional exception: Java Native Methods). Performance on
the same hardware with other IBM JVMs will be roughly equal, except that newer JVMs will often arrive
a bit later on Linux. The IBM JVM is almost always much faster than the typical open source JVM
supplied in many distributions.
Web Serving Performance
Work has been done with web serving solutions. Here is some information (primarily useful for sizing,
not performance
per se
), which gives some idea of the web serving capacity for static web serving.
4,961
3,984
1,726
860
# of web server
hits per second,
khttpd
3,755
1,878
1,024
514
# of web server
hits per second,
Apache 1.3
4
2
1
0.5
Number of 840
Processors in
Partition
IBM i 6.1 Performance Capabilities Reference - January/April/October 2008
©
Copyright IBM Corp. 2008
Chapter 13 - Linux
182
