2014-11-03 14:39 GMT+08:00 Sven Barth <pascaldra...@googlemail.com>: > > Would you mind to show the timings that you got for FillChar? :)
Using FillChar is always about 5% (or less) faster than FillQWord when used with GetMemory, but will be around 20%-40% faster if the memory is allocated by SetLength. Additionally this switch won't help you. The memory buffer that is > allocated by SetLength is also allocated using GetMemory. So the buffer > itself *is* aligned. But you don't get the start byte of the buffer in case > of SetLength, but the first byte after the information record which might > not be aligned correctly and *no* compiler switch will help you with that. > Then the problem remains with SetLength vs. GetMemory... Why SetLength is about 10000x (!) slower than GetMemory? allocating 1G memory took about 0.1 second by SetLength, but is about 1E-5 via GetMemory.
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