[Serusers] Memory error

[Mook]

I'm running a Linux red Hat 9.0 with all updates, I have 512 MB ram, ser 0.8.12 .
I writes a module and compiles it fine.When ser receive invite request, this module will be executed.
Then I gets the following error message.

May  6 15:11:58 nw127 /usr/local/sbin/ser[3154]: Error: new_module: memory allocation error
May  6 15:11:58 nw127 /usr/local/sbin/ser[3154]: Error: new_module: execute failed
May  6 15:11:58 nw127 /usr/local/sbin/ser[3154]: ERROR: do_action: memory allocation failure
May  6 15:11:58 nw127 /usr/local/sbin/ser[3154]: rwrite(): Error in do_action
May  6 15:11:58 nw127 /usr/local/sbin/ser[3154]: lookup(): Unable to rewrite Request-URI
May  6 15:11:58 nw127 /usr/local/sbin/ser[3154]: ERROR: build_res_buf_from_sip_req: out of memory  ; needs 539
May  6 15:13:21 nw127 /usr/local/sbin/ser[3118]: WARNING: unhandled signal 12
May  6 15:15:47 nw127 /usr/local/sbin/ser[3163]: build_rr(): No memory left
May  6 15:15:47 nw127 /usr/local/sbin/ser[3163]: insert_RR(): Error while inserting outbound Record-Route
May  6 15:15:47 nw127 /usr/local/sbin/ser[3163]: record_route(): Error while inserting Record-Route line
May  6 15:15:47 nw127 /usr/local/sbin/ser[3163]: ERROR: do_action: memory allocation failure
May  6 15:15:47 nw127 /usr/local/sbin/ser[3163]: rwrite(): Error in do_action
May  6 15:15:47 nw127 /usr/local/sbin/ser[3163]: lookup(): Unable to rewrite Request-URI
May  6 15:15:47 nw127 /usr/local/sbin/ser[3163]: ERROR: build_res_buf_from_sip_req: out of memory  ; needs 589
May  6 15:15:47 nw127 /usr/local/sbin/ser[3166]: build_rr(): No memory left
May  6 15:15:47 nw127 /usr/local/sbin/ser[3166]: insert_RR(): Error while inserting outbound Record-Route
May  6 15:15:47 nw127 /usr/local/sbin/ser[3166]: record_route(): Error while inserting Record-Route line
May  6 15:15:47 nw127 /usr/local/sbin/ser[3166]: ERROR: mk_proxy: memory allocation failure

I change the value of PKG_MEM_POOL_SIZE by 10240*1024 in config.h and recompile.
But I still has the same memory error message.How can get memory statistics when I send kill -SIGUSR1?

Mook.
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