Yeah, default is 1.25. We can certainly start with 1.25. Thanks again,
Tony Wu > On Nov 12, 2020, at 4:09 PM, dormando <dorma...@rydia.net> wrote: > > what's the default? you probably don't need to change it from the default > at all, which should have a good spread. default is 1.25 I think. > > On Thu, 12 Nov 2020, Tony Wu wrote: > >> Hi, >> >> The engine version we have running right now is 1.5.16. I just saw an >> announcement that 1.6.6 is available, so we’ll probably plan to migrate. >> >> Adjusting growth factor makes sense. I did a quick google and don’t see >> any definitive formula to calculate an appropriate number. I’ll probably >> start with 2 or 3 and adjust it from there. >> >> Thanks, >> >> Tony Wu >> >>> On Nov 12, 2020, at 3:50 PM, dormando <dorma...@rydia.net> wrote: >>> >>> 1.5.what? >>> >>> also yes, chunk_size_growth_factor. don't set it to 1.02. set it to >>> something so your slab classes are more evenly distributed. the max is 63. >>> >>> On Thu, 12 Nov 2020, Tony Wu wrote: >>> >>>> Hi Dormando, >>>> >>>> Thanks for the reply, I believe the engine version is 1.5. By multiplier >>>> I assumed you meant “chunk_size_growth_factor”, which is currently set >>>> at 1.02. >>>> >>>> Best, >>>> >>>> Tony Wu >>>> >>>>> On Nov 12, 2020, at 2:26 PM, dormando <dorma...@rydia.net> wrote: >>>>> >>>>> What version are they running now? That stat output looks pretty sparse. >>>>> >>>>> Unfortunately when it comes to elasticache the answer is probably to just >>>>> beg them to upgrade to a newer version. they tend to run really old and >>>>> newer verisons do a lot better at balancing memory. >>>>> >>>>> This is also suspect: >>>>>> STAT 62:chunk_size 712 >>>>>> STAT 62:total_chunks 4416 >>>>>> STAT 62:free_chunks 631 >>>>>> STAT 62:free_chunks_end 0 >>>>>> STAT 63:chunk_size 524288 >>>>> >>>>> anything you store that's larger than 712 bytes will use half a megabyte >>>>> of memory. If you're setting the slab multiplier (-f) to something really >>>>> aggressive, you should stop that :) >>>>> >>>>> On Thu, 12 Nov 2020, Tony Wu wrote: >>>>> >>>>>> We are currently using memcached provided by AWS ElastiCache service in >>>>>> modern mode to store web session keys >>>>>> among other things. We are observing session keys being evicted before >>>>>> TTL even though the cluster seems to have >>>>>> ample free memory, which hints at slab imbalance. I've included a print >>>>>> out of slab stats below in terms of >>>>>> sizing and total / free pages. >>>>>> What would be the best way to smooth out this imbalance? We already >>>>>> enabled slab reassign / auto-move under >>>>>> modern mode. >>>>>> >>>>>> Thanks. >>>>>> >>>>>> STAT 1:chunk_size 96 >>>>>> STAT 1:total_chunks 131064 >>>>>> STAT 1:free_chunks 1664 >>>>>> STAT 1:free_chunks_end 0 >>>>>> STAT 2:chunk_size 104 >>>>>> STAT 2:total_chunks 60492 >>>>>> STAT 2:free_chunks 5327 >>>>>> STAT 2:free_chunks_end 0 >>>>>> STAT 3:chunk_size 112 >>>>>> STAT 3:total_chunks 46810 >>>>>> STAT 3:free_chunks 79 >>>>>> STAT 3:free_chunks_end 0 >>>>>> STAT 4:chunk_size 120 >>>>>> STAT 4:total_chunks 26214 >>>>>> STAT 4:free_chunks 48 >>>>>> STAT 4:free_chunks_end 0 >>>>>> STAT 5:chunk_size 128 >>>>>> STAT 5:total_chunks 32768 >>>>>> STAT 5:free_chunks 6193 >>>>>> STAT 5:free_chunks_end 0 >>>>>> STAT 6:chunk_size 136 >>>>>> STAT 6:total_chunks 23130 >>>>>> STAT 6:free_chunks 4594 >>>>>> STAT 6:free_chunks_end 0 >>>>>> STAT 7:chunk_size 144 >>>>>> STAT 7:total_chunks 7281 >>>>>> STAT 7:free_chunks 5894 >>>>>> STAT 7:free_chunks_end 0 >>>>>> STAT 8:chunk_size 152 >>>>>> STAT 8:total_chunks 13796 >>>>>> STAT 8:free_chunks 12008 >>>>>> STAT 8:free_chunks_end 0 >>>>>> STAT 9:chunk_size 160 >>>>>> STAT 9:total_chunks 6553 >>>>>> STAT 9:free_chunks 6316 >>>>>> STAT 9:free_chunks_end 0 >>>>>> STAT 10:chunk_size 168 >>>>>> STAT 10:total_chunks 6241 >>>>>> STAT 10:free_chunks 6186 >>>>>> STAT 10:free_chunks_end 0 >>>>>> STAT 11:chunk_size 176 >>>>>> STAT 11:total_chunks 5957 >>>>>> STAT 11:free_chunks 5946 >>>>>> STAT 11:free_chunks_end 0 >>>>>> STAT 12:chunk_size 184 >>>>>> STAT 12:total_chunks 5698 >>>>>> STAT 12:free_chunks 5664 >>>>>> STAT 12:free_chunks_end 0 >>>>>> STAT 13:chunk_size 192 >>>>>> STAT 13:total_chunks 5461 >>>>>> STAT 13:free_chunks 5380 >>>>>> STAT 13:free_chunks_end 0 >>>>>> STAT 14:chunk_size 200 >>>>>> STAT 14:total_chunks 5242 >>>>>> STAT 14:free_chunks 5135 >>>>>> STAT 14:free_chunks_end 0 >>>>>> STAT 15:chunk_size 208 >>>>>> STAT 15:total_chunks 5041 >>>>>> STAT 15:free_chunks 4892 >>>>>> STAT 15:free_chunks_end 0 >>>>>> STAT 16:chunk_size 216 >>>>>> STAT 16:total_chunks 4854 >>>>>> STAT 16:free_chunks 4770 >>>>>> STAT 16:free_chunks_end 0 >>>>>> STAT 17:chunk_size 224 >>>>>> STAT 17:total_chunks 4681 >>>>>> STAT 17:free_chunks 4655 >>>>>> STAT 17:free_chunks_end 0 >>>>>> STAT 18:chunk_size 232 >>>>>> STAT 18:total_chunks 4519 >>>>>> STAT 18:free_chunks 4489 >>>>>> STAT 18:free_chunks_end 0 >>>>>> STAT 19:chunk_size 240 >>>>>> STAT 19:total_chunks 4369 >>>>>> STAT 19:free_chunks 4345 >>>>>> STAT 19:free_chunks_end 0 >>>>>> STAT 20:chunk_size 248 >>>>>> STAT 20:total_chunks 4228 >>>>>> STAT 20:free_chunks 4217 >>>>>> STAT 20:free_chunks_end 0 >>>>>> STAT 21:chunk_size 256 >>>>>> STAT 21:total_chunks 4096 >>>>>> STAT 21:free_chunks 4091 >>>>>> STAT 21:free_chunks_end 0 >>>>>> STAT 22:chunk_size 264 >>>>>> STAT 22:total_chunks 3971 >>>>>> STAT 22:free_chunks 3966 >>>>>> STAT 22:free_chunks_end 0 >>>>>> STAT 23:chunk_size 272 >>>>>> STAT 23:total_chunks 3855 >>>>>> STAT 23:free_chunks 3851 >>>>>> STAT 23:free_chunks_end 0 >>>>>> STAT 24:chunk_size 280 >>>>>> STAT 24:total_chunks 3744 >>>>>> STAT 24:free_chunks 3738 >>>>>> STAT 24:free_chunks_end 0 >>>>>> STAT 25:chunk_size 288 >>>>>> STAT 25:total_chunks 3640 >>>>>> STAT 25:free_chunks 3638 >>>>>> STAT 25:free_chunks_end 0 >>>>>> STAT 26:chunk_size 296 >>>>>> STAT 26:total_chunks 3542 >>>>>> STAT 26:free_chunks 3533 >>>>>> STAT 26:free_chunks_end 0 >>>>>> STAT 27:chunk_size 304 >>>>>> STAT 27:total_chunks 3449 >>>>>> STAT 27:free_chunks 3448 >>>>>> STAT 27:free_chunks_end 0 >>>>>> STAT 28:chunk_size 312 >>>>>> STAT 28:total_chunks 3360 >>>>>> STAT 28:free_chunks 3350 >>>>>> STAT 28:free_chunks_end 0 >>>>>> STAT 29:chunk_size 320 >>>>>> STAT 29:total_chunks 3276 >>>>>> STAT 29:free_chunks 3273 >>>>>> STAT 29:free_chunks_end 0 >>>>>> STAT 30:chunk_size 328 >>>>>> STAT 30:total_chunks 3196 >>>>>> STAT 30:free_chunks 3174 >>>>>> STAT 30:free_chunks_end 0 >>>>>> STAT 31:chunk_size 336 >>>>>> STAT 31:total_chunks 3120 >>>>>> STAT 31:free_chunks 3118 >>>>>> STAT 31:free_chunks_end 0 >>>>>> STAT 32:chunk_size 344 >>>>>> STAT 32:total_chunks 3048 >>>>>> STAT 32:free_chunks 3043 >>>>>> STAT 32:free_chunks_end 0 >>>>>> STAT 33:chunk_size 352 >>>>>> STAT 33:total_chunks 2978 >>>>>> STAT 33:free_chunks 2954 >>>>>> STAT 33:free_chunks_end 0 >>>>>> STAT 34:chunk_size 360 >>>>>> STAT 34:total_chunks 2912 >>>>>> STAT 34:free_chunks 2903 >>>>>> STAT 34:free_chunks_end 0 >>>>>> STAT 35:chunk_size 368 >>>>>> STAT 35:total_chunks 2849 >>>>>> STAT 35:free_chunks 2828 >>>>>> STAT 35:free_chunks_end 0 >>>>>> STAT 36:chunk_size 376 >>>>>> STAT 36:total_chunks 2788 >>>>>> STAT 36:free_chunks 2766 >>>>>> STAT 36:free_chunks_end 0 >>>>>> STAT 37:chunk_size 384 >>>>>> STAT 37:total_chunks 2730 >>>>>> STAT 37:free_chunks 2684 >>>>>> STAT 37:free_chunks_end 0 >>>>>> STAT 38:chunk_size 392 >>>>>> STAT 38:total_chunks 2674 >>>>>> STAT 38:free_chunks 2621 >>>>>> STAT 38:free_chunks_end 0 >>>>>> STAT 39:chunk_size 400 >>>>>> STAT 39:total_chunks 2621 >>>>>> STAT 39:free_chunks 2564 >>>>>> STAT 39:free_chunks_end 0 >>>>>> STAT 40:chunk_size 408 >>>>>> STAT 40:total_chunks 2570 >>>>>> STAT 40:free_chunks 2527 >>>>>> STAT 40:free_chunks_end 0 >>>>>> STAT 41:chunk_size 416 >>>>>> STAT 41:total_chunks 2520 >>>>>> STAT 41:free_chunks 2216 >>>>>> STAT 41:free_chunks_end 0 >>>>>> STAT 42:chunk_size 424 >>>>>> STAT 42:total_chunks 2473 >>>>>> STAT 42:free_chunks 2256 >>>>>> STAT 42:free_chunks_end 0 >>>>>> STAT 43:chunk_size 432 >>>>>> STAT 43:total_chunks 2427 >>>>>> STAT 43:free_chunks 2299 >>>>>> STAT 43:free_chunks_end 0 >>>>>> STAT 44:chunk_size 440 >>>>>> STAT 44:total_chunks 2383 >>>>>> STAT 44:free_chunks 1898 >>>>>> STAT 44:free_chunks_end 0 >>>>>> STAT 45:chunk_size 448 >>>>>> STAT 45:total_chunks 2340 >>>>>> STAT 45:free_chunks 1962 >>>>>> STAT 45:free_chunks_end 0 >>>>>> STAT 46:chunk_size 456 >>>>>> STAT 46:total_chunks 2299 >>>>>> STAT 46:free_chunks 2192 >>>>>> STAT 46:free_chunks_end 0 >>>>>> STAT 47:chunk_size 472 >>>>>> STAT 47:total_chunks 2221 >>>>>> STAT 47:free_chunks 2061 >>>>>> STAT 47:free_chunks_end 0 >>>>>> STAT 48:chunk_size 488 >>>>>> STAT 48:total_chunks 2148 >>>>>> STAT 48:free_chunks 2047 >>>>>> STAT 48:free_chunks_end 0 >>>>>> STAT 49:chunk_size 504 >>>>>> STAT 49:total_chunks 2080 >>>>>> STAT 49:free_chunks 1955 >>>>>> STAT 49:free_chunks_end 0 >>>>>> STAT 50:chunk_size 520 >>>>>> STAT 50:total_chunks 2016 >>>>>> STAT 50:free_chunks 1788 >>>>>> STAT 50:free_chunks_end 0 >>>>>> STAT 51:chunk_size 536 >>>>>> STAT 51:total_chunks 1956 >>>>>> STAT 51:free_chunks 1870 >>>>>> STAT 51:free_chunks_end 0 >>>>>> STAT 52:chunk_size 552 >>>>>> STAT 52:total_chunks 1899 >>>>>> STAT 52:free_chunks 1829 >>>>>> STAT 52:free_chunks_end 0 >>>>>> STAT 53:chunk_size 568 >>>>>> STAT 53:total_chunks 1846 >>>>>> STAT 53:free_chunks 1762 >>>>>> STAT 53:free_chunks_end 0 >>>>>> STAT 54:chunk_size 584 >>>>>> STAT 54:total_chunks 1795 >>>>>> STAT 54:free_chunks 1613 >>>>>> STAT 54:free_chunks_end 0 >>>>>> STAT 55:chunk_size 600 >>>>>> STAT 55:total_chunks 1747 >>>>>> STAT 55:free_chunks 1446 >>>>>> STAT 55:free_chunks_end 0 >>>>>> STAT 56:chunk_size 616 >>>>>> STAT 56:total_chunks 1702 >>>>>> STAT 56:free_chunks 1358 >>>>>> STAT 56:free_chunks_end 0 >>>>>> STAT 57:chunk_size 632 >>>>>> STAT 57:total_chunks 1659 >>>>>> STAT 57:free_chunks 1497 >>>>>> STAT 57:free_chunks_end 0 >>>>>> STAT 58:chunk_size 648 >>>>>> STAT 58:total_chunks 1618 >>>>>> STAT 58:free_chunks 1398 >>>>>> STAT 58:free_chunks_end 0 >>>>>> STAT 59:chunk_size 664 >>>>>> STAT 59:total_chunks 3158 >>>>>> STAT 59:free_chunks 1784 >>>>>> STAT 59:free_chunks_end 0 >>>>>> STAT 60:chunk_size 680 >>>>>> STAT 60:total_chunks 1542 >>>>>> STAT 60:free_chunks 1301 >>>>>> STAT 60:free_chunks_end 0 >>>>>> STAT 61:chunk_size 696 >>>>>> STAT 61:total_chunks 3012 >>>>>> STAT 61:free_chunks 302 >>>>>> STAT 61:free_chunks_end 0 >>>>>> STAT 62:chunk_size 712 >>>>>> STAT 62:total_chunks 4416 >>>>>> STAT 62:free_chunks 631 >>>>>> STAT 62:free_chunks_end 0 >>>>>> STAT 63:chunk_size 524288 >>>>>> STAT 63:total_chunks 26108 >>>>>> STAT 63:free_chunks 0 >>>>>> STAT 63:free_chunks_end 0 >>>>>> >>>>>> -- >>>>>> >>>>>> --- >>>>>> You received this message because you are subscribed to the Google >>>>>> Groups "memcached" group. >>>>>> To unsubscribe from this group and stop receiving emails from it, send >>>>>> an email to >>>>>> memcached+unsubscr...@googlegroups.com. >>>>>> To view this discussion on the web visit >>>>>> https://groups.google.com/d/msgid/memcached/927615f7-187d-4c8f-9e08-f1f341b9a04an%40googlegroups.com. >>>>>> >>>>>> >>>>> >>>>> -- >>>>> >>>>> --- >>>>> You received this message because you are subscribed to the Google Groups >>>>> "memcached" group. >>>>> To unsubscribe from this group and stop receiving emails from it, send an >>>>> email to memcached+unsubscr...@googlegroups.com. >>>>> To view this discussion on the web visit >>>>> 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