[armedbear-devel] Compiling large Java-classes slow?

Ole Myren Rohne ole.rohne at free.fr
Wed Aug 24 12:23:56 UTC 2011

Hi Erik,

Thank you for your reply! Sorry for confusing subject-line and the brief initial message; here are more details:

I'm using ABCL as a JSR-223 scripting language for the Electric VLSI system. To access the Electric's Java-classes I have a hacked-up version of JFLI, conveniently allowing me to say eg 
> (def-java-class "com.sun.electric.database.network.Netlist")
to get wrappers for the Java-members of that class. The JFLI-magic obviously happens by introspection (JCLASS-METHODS), basically generating a ton of (lazy) member-wrapping functions.

As I watch the embedded ABCL compile a file #p"tool.lisp" of such DEF-JAVA-CLASS statements, it immediately spits out hundreds of temporary cls-files and a abcl-file,
> -rw-r--r--  1 mrohne  staff    1790 Aug 24 08:04 ASDF_TMP_tool_9.cls
> -rw-r--r--  1 mrohne  staff    1800 Aug 24 08:04 ASDF_TMP_tool_8.cls
> -rw-r--r--  1 mrohne  staff    1787 Aug 24 08:04 ASDF_TMP_tool_7.cls
> (...)
> -rw-r--r--  1 mrohne  staff    1254 Aug 24 08:04 ASDF_TMP_tool_244.cls
> -rw-r--r--  1 mrohne  staff    1359 Aug 24 08:04 ASDF_TMP_tool_243.cls
> -rw-r--r--  1 mrohne  staff    1248 Aug 24 08:04 ASDF_TMP_tool_242.cls
> -rw-r--r--  1 mrohne  staff    1362 Aug 24 08:04 ASDF_TMP_tool_241.cls
> -rw-r--r--  1 mrohne  staff  108500 Aug 24 08:04 ASDF-TMP-tool.abcl
then goes on chewing on those files for quite a while. Eventually it removes the cls-files and (I assume) renames ASDF-TMP-tool.abcl to tool.abcl. The chewing-time grows non-linearly with the number of cls-files, which in turn seems to depend on the "size" of the Java-class being wrapped, hence my confusing subject-line. A few hundred cls-files finishes in minutes, while more than a thousand easily takes the full morning. A few months back ABCL behaved quite differently, compiling many tens of  JFLI-imported classes in a few minutes, so I'm wondering what might have changed?


On 2011-08-23, at 16:39 , Erik Huelsmann wrote:

> Hi Ole,
> On Tue, Aug 23, 2011 at 2:54 PM, Ole Myren Rohne <ole.rohne at free.fr> wrote:
> Hi ABCL-developers,
> Is there a recent change (since May?) that would have made compiling files containing large wrapped Java-classes excessively slow? If so, is there any hope of this eventually improving?
> Do you have an example of what you're referring to? I'm affraid I'm not fully understanding what you're trying to do. If there's an obvious performance problem, I sure hope we can do something about it. We do not normally accept performance regressions outside our own build times.
> That said, I've only seen build and runtimes improve over the last years (I mainly test with the compilation of Maxima, though).
> Bye,
> Erik.

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