wsfull memory swap full - Kdb+ / qStudio

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This topic contains 1 reply, has 2 voices, and was last updated by  Ryan Hamilton 8 years, 8 months ago.

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  • #137

    Stephen Withers

    We often run out of swap on our linux kdb server, memory never seems to be freed.
    Is there anyway to force Kdb to free memory without restarting it?

    #153

    Hi Stephen,

    What version of kdb are you running? as your options vary a lot depending on version.

    We have a tutorial on kdb memory usage that should give you insight into where your memory is being used particularly garbage collection:
    http://www.timestored.com/kdb-guides/memory-management#garbage_collection

    Example of heap space only being freed after calling the garbage collector:

    q)b:10000000?100.
    q).Q.w[]`used`heap
    134352896 201326592
    q)b:1
    q).Q.w[]`used`heap
    135184 201326592
    q).Q.gc[]
    134217728
    q).Q.w[]`used`heap
    135184 67108864

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