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>> Judging from the level of discussion on various other lists I'm >> on, none of java, perl, or python were designed with lightweight, >> accurate, and meaningful profiling of their own run time built in. > >Not so. With Java 2, check out "java -Xrunhprof:help" output to >see the built in profiler. Works nicely on SPARC out of the box, >but the Win32 version at one point needed a JIT update to get CPU >profiling to work (by default it only does memory profiling). All the languages I mentioned have profiling hooks for "end programmers" using the language, of varying usability and accuracy. That is different from the kind of profiling that language implementors need, which ideally would allow for easy delving into the behavior of the runtime (typically C functions) in addition to the language-level profiling. This would be complemented by things like VM instruction histogramming, and introspection into other counters (the moral equivalent of oracle's V$ tables). In the case of a proprietary language like java, this lack of public implementor tools is understandable, as such tools represent a competitive advantage for VM implementors. For example, the implementors of the microsoft VM and the implementors of the sun VM have each created completely different private interfaces for performance instrumentation of their own VMs. -mda xml-dev: A list for W3C XML Developers. To post, mailto:xml-dev@i... Archived as: http://www.lists.ic.ac.uk/hypermail/xml-dev/ and on CD-ROM/ISBN 981-02-3594-1 To (un)subscribe, mailto:majordomo@i... the following message; (un)subscribe xml-dev To subscribe to the digests, mailto:majordomo@i... the following message; subscribe xml-dev-digest List coordinator, Henry Rzepa (mailto:rzepa@i...)
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