mikemccand commented on issue #13768: URL: https://github.com/apache/lucene/issues/13768#issuecomment-2346033320
Well, I ran [`knnPerfTest.py`](https://github.com/mikemccand/luceneutil/blob/f4a07ed8de36c47aacb6033a3709e236bc42aca4/src/python/knnPerfTest.py) on my Linux dev box (x86-64 Raptorlake i9-13900K). This CPU has crazy number of flags, but NOT AVX-512: ``` flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx pdpe1gb rdtscp lm constant_tsc art arch_perfmon pebs bts rep_good nopl xtopology nonstop_tsc cpuid aperfmperf tsc_known_freq pni pclmulqdq dtes64 monitor ds_cpl vmx smx est tm2 ssse3 sdbg fma cx16 xtpr pdcm pcid sse4_1 sse4_2 x2apic movbe popcnt tsc_deadline_timer aes xsave avx f16c rdrand lahf_lm abm 3dnowprefetch cpuid_fault ssbd ibrs ibpb stibp ibrs_enhanced tpr_shadow flexpriority ept vpid ept_ad fsgsbase tsc_adjust bmi1 avx2 smep bmi2 erms invpcid rdseed adx smap clflushopt clwb intel_pt sha_ni xsaveopt xsavec xgetbv1 xsaves split_lock_detect user_shstk avx_vnni dtherm ida arat pln pts hwp hwp_notify hwp_act_window hwp_epp hwp_pkg_req hfi vnmi umip pku ospke waitpkg gfni vaes vpclmulqdq tme rdpid movdiri movdir64b fsrm md_clear serialize pconfig arch_lbr ibt flush_l1d arch_capabilities ``` This is with Panama enabled (`INFO: Java vector incubator API enabled; uses preferredBitSize=256; FMA enabled`). I'll try with Panama disabled next. Results: ``` recall latency (ms) nDoc topK fanout maxConn beamWidth quantized index s force merge s num segments index size (MB) 0.319 0.167 1500000 10 6 32 50 4 bits 86.01 64.49 1 5013.19 0.326 0.187 1500000 10 6 32 50 4 bits 89.03 74.99 1 5562.51 ``` Unfortunately the output doesn't state it, but the first row is `compress=True` and 2nd is `compress=False`. Indeed, latency (search time) got faster (187 usec -> 167 usec) with `compress=True`, and this is quite a reduction (~10% ish) in index size. Indexing and force merge time did get a bit slower ... -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: issues-unsubscr...@lucene.apache.org For queries about this service, please contact Infrastructure at: us...@infra.apache.org --------------------------------------------------------------------- To unsubscribe, e-mail: issues-unsubscr...@lucene.apache.org For additional commands, e-mail: issues-h...@lucene.apache.org
