[Pljava-dev] Is it safe to use multi-threaded PL/Java in single-threaded postgres process?

Hello all,

it seems most likely that I will fail to convince my colleagues to use
PL/Java. The performance was not as good as I expected compared to running
Java functions in a process different from postgres. On RHEL6 with
PostgreSQL 9.2.8, I got the following results when I ran 10000 UPDATE
statements in a single transaction, excluding the time of BEGIN and COMMIT:

* PL/pgSQL: 20 seconds
* PL/Java: 22 seconds (see the attached BatchPL.java for processing)
* Standalone client running on the same server as the database server: 23
seconds (see Batch.java, which does the same job as BatchPL.java)

I avoided the influence of I/O by setting:

wal_buffers = 16MB
checkpoint_segments = 100
checkpoint_timeout = 1h

So I couldn't insist that PL/Java is required to greatly reduce the overhead
of interprocess communication and process context switches. Any ideas?

Regards
MauMau
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