Re: lock contention on parallel COPY ?

Tom Lane wrote:
> Simon Riggs <simon@2ndQuadrant.com> writes:
>> Stefan Kaltenbrunner <stefan@kaltenbrunner.cc> writes:
>>> samples  %        symbol name
>>> 55526    16.5614  LWLockAcquire
>>> 29721     8.8647  DoCopy
>>> 26581     7.9281  CopyReadLine
>>> 25105     7.4879  LWLockRelease
>>> 15743     4.6956  PinBuffer
>>> 14725     4.3919  heap_formtuple
> 
>> Probably loading a table with a generated PK or loading data in
>> ascending sequence, so its contending heavily for the rightmost edge of
>> the index.
> 
> No, given that DoCopy and CopyReadLine are right up there, I think we're
> still looking at the COPY phase, not index building.
> 
> The profile will probably change completely once index building
> starts...

yeah this profile is only showing the COPY phase ...

Stefan