Kouhei Sutou
null+****@clear*****
Thu Mar 6 12:45:22 JST 2014
Kouhei Sutou 2014-03-06 12:45:22 +0900 (Thu, 06 Mar 2014) New Revision: d9c6db60bb00b723953b5472aa9b8244095db09d https://github.com/groonga/groonga/commit/d9c6db60bb00b723953b5472aa9b8244095db09d Message: ja: improve recycling garbage data This change increases threshold for big data mode and small data mode. We treated 127 (= 2 ** 7 - 1) or smaller size data as small data before this change. Now we treated 65535 (= 2 ** 16 - 1) or smaller data as small data. Small data are managed separately for each size range. For example, [2**0, 2**1) [2**1, 2**2), [2**2, 2**3) and so on. Each separation keeps datum as an array. It is easy to recycle data but it is less memory efficiency. For example, think [2**15, 2**16) case. It uses 2 ** 16 size memory for 2 ** 15 + 1 size data. (2 ** 16) - (2 ** 15 + 1) size memory isn't used. This less memory efficiency has more effect for range range such as [2**15, 2**16). Large data are managed as packed list. It is difficult to recycle data but uses memory effectively. If no data update use case, this change increases database size. This is a bad case. If you have many small ShortText or COLUMN_VECTOR columns, you may face a problem. If many small data update use case, this change keeps database size. This is a good case. Normally, increasing database size will be in the allowable range. Modified files: lib/store.c Modified: lib/store.c (+2 -2) =================================================================== --- lib/store.c 2014-03-05 18:24:55 +0900 (64a0e64) +++ lib/store.c 2014-03-06 12:45:22 +0900 (2a1e356) @@ -1,5 +1,5 @@ /* -*- c-basic-offset: 2 -*- */ -/* Copyright(C) 2009-2012 Brazil +/* Copyright(C) 2009-2014 Brazil This library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public @@ -203,7 +203,7 @@ grn_ra_cache_fin(grn_ctx *ctx, grn_ra *ra, grn_id id) /**** jagged arrays ****/ -#define GRN_JA_W_SEGREGATE_THRESH 7 +#define GRN_JA_W_SEGREGATE_THRESH 16 #define GRN_JA_W_CAPACITY 38 #define GRN_JA_W_SEGMENT 22 -------------- next part -------------- HTML����������������������������...Download