Hi,
Thank you for your reply. I tried your patch and report in this e-mail. > 1. Those code paths finish up in pg_pwritev(), but it has a loop over > 8kb writes on Windows. Does it help if we just make "zbuffer" bigger? > How big? This patch improves the performance. I applied 0001-Use-bigger-writes-in-pg_pwrite_zeros-on-Windows.patch over REL_16_6. I changed the value "zbuffer" from 2 to 32. I measured with nclients = 1. 16.6: 453s 16.6 + patch (zbuffer = 2): 442s 16.6 + patch (zbuffer = 4): 434s 16.6 + patch (zbuffer = 8): 430s 16.6 + patch (zbuffer = 16): 429s 16.6 + patch (zbuffer = 32): 428s Performance improved up to 8KB and remained stable after that. > 2. While pondering the goals of posix_fallocate(), I had a > realisation about how we might implement FileFallocate() on Windows. > Does this idea work? Well? This patch degrades the performance. 16.6: 453s 16.6 + patch: 479s Regards, Ryohei Takahashi
