EMA Batch snapsoot with potential memmory leak

nitsiosa
nitsiosa
in EMA

image

Hi,

this is my code :

instrumentsInQuestion.forEach(instrument -> arrayI.add(EmaFactory.createOmmArrayEntry().codeState().ascii(instrument.getRootSymbol())));
arrayView.add(EmaFactory.createOmmArrayEntry().intValue(1));
batchView.add(EmaFactory.createElementEntry().array(EmaRdm.ENAME_BATCH_ITEM_LIST, arrayI));
batchView.add(EmaFactory.createElementEntry().uintValue(EmaRdm.ENAME_VIEW_TYPE, 1));
batchView.add(EmaFactory.createElementEntry().array(EmaRdm.ENAME_VIEW_DATA, arrayView));

ReqMsg reqMsg = EmaFactory.createReqMsg();

reqMsg.serviceName(serviceName).payload(batchView).interestAfterRefresh(false).initialImage(true);

consumer.registerClient(reqMsg, appClient);

....

i collect the handleids and unregister the instruments from

instrumentsInQuestion.forEach(instrumentInQuestion -> {

try {

CompletableFuture.supplyAsync(() -> {

try {

if (instrumentInQuestion.getHandleId() != null)
consumer.unregister(instrumentInQuestion.getHandleId());
else
log.info("Could not get handlerid for "+instrumentInQuestion.getRootSymbol());
} catch (Exception e) {

e.printStackTrace();
}
return true;
}).get(20, TimeUnit.SECONDS);
} catch (InterruptedException | ExecutionException | TimeoutException e) {

log.severe("Error unregistering " + instrumentInQuestion.getRootSymbol());
}
});

i have attached the heat dump, screen shoot.

My question is what am i doing wrong and I have 1.6GB of memory wasted?

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Best Answer

  • wasin.w
    wasin.w admin
    Answer ✓

    Update:
    The Elektron API support team has asked the client perform
    a GC and do heap dump at the end of processing of every batch to see if the
    memory consumption continues to grow.

    They has analysis the head dump files and found that

    the
    numbers of WIRequest objects remain constant at 605 instances in all heap dump
    files. This evidence indicates that it is an expected behavior, not a memory
    leak.

    image

    image

Answers

  • nitsiosa
    nitsiosa

    ok @zoya.farberov, yes i added a support request on TRDC [service req no 05837804], just now , but i feel that the answer to something like that would be beneficial to all users

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    Matthew.Logterman

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    gloribeneg09

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