Mercurial > hg > nginx
annotate auto/lib/libatomic/conf @ 8078:5244d3b165ff
SSL: single allocation in session cache on 32-bit platforms.
Given the present typical SSL session sizes, on 32-bit platforms it is
now beneficial to store all data in a single allocation, since rbtree
node + session id + ASN1 representation of a session takes 256 bytes of
shared memory (36 + 32 + 150 = about 218 bytes plus SNI server name).
Storing all data in a single allocation is beneficial for SNI names up to
about 40 characters long and makes it possible to store about 4000 sessions
in one megabyte (instead of about 3000 sessions now). This also slightly
simplifies the code.
| author | Maxim Dounin <mdounin@mdounin.ru> |
|---|---|
| date | Wed, 12 Oct 2022 20:14:40 +0300 |
| parents | d620f497c50f |
| children |
| rev | line source |
|---|---|
| 3363 | 1 |
| 2 # Copyright (C) Igor Sysoev | |
| 4412 | 3 # Copyright (C) Nginx, Inc. |
| 3363 | 4 |
| 5 | |
| 6 if [ $NGX_LIBATOMIC != YES ]; then | |
| 7 | |
| 8 have=NGX_HAVE_LIBATOMIC . auto/have | |
| 9 CORE_INCS="$CORE_INCS $NGX_LIBATOMIC/src" | |
| 10 LINK_DEPS="$LINK_DEPS $NGX_LIBATOMIC/src/libatomic_ops.a" | |
| 11 CORE_LIBS="$CORE_LIBS $NGX_LIBATOMIC/src/libatomic_ops.a" | |
| 12 | |
| 13 else | |
| 14 | |
| 15 ngx_feature="atomic_ops library" | |
| 16 ngx_feature_name=NGX_HAVE_LIBATOMIC | |
| 3366 | 17 ngx_feature_run=yes |
|
3378
5d17022a1e88
fix libatomic usage on arm, cris, hppa, m68k, and sparc platforms
Igor Sysoev <igor@sysoev.ru>
parents:
3366
diff
changeset
|
18 ngx_feature_incs="#define AO_REQUIRE_CAS |
|
5d17022a1e88
fix libatomic usage on arm, cris, hppa, m68k, and sparc platforms
Igor Sysoev <igor@sysoev.ru>
parents:
3366
diff
changeset
|
19 #include <atomic_ops.h>" |
| 3363 | 20 ngx_feature_path= |
| 21 ngx_feature_libs="-latomic_ops" | |
| 3366 | 22 ngx_feature_test="long n = 0; |
| 23 if (!AO_compare_and_swap(&n, 0, 1)) | |
| 24 return 1; | |
| 25 if (AO_fetch_and_add(&n, 1) != 1) | |
| 26 return 1; | |
| 27 if (n != 2) | |
| 28 return 1; | |
| 3363 | 29 AO_nop();" |
| 30 . auto/feature | |
| 31 | |
| 32 if [ $ngx_found = yes ]; then | |
| 33 CORE_LIBS="$CORE_LIBS $ngx_feature_libs" | |
| 34 else | |
| 35 | |
| 36 cat << END | |
| 37 | |
| 38 $0: error: libatomic_ops library was not found. | |
| 39 | |
| 40 END | |
| 41 exit 1 | |
| 42 fi | |
| 43 fi |