Introduced a new log verbosity level, so now DEBUG is really for debugging. Refactored a bit maxmemory. When virtual memory is short in RAM free the objects freelist as well as swapping things out.

LZF compression re-enabled by default, but with INIT_HTAB set to 0 to avoid the very costly memset initialization. Note that with this option set valgrind will output some false positive about lzf_c.c

Changed the reply of BGSAVE and BGREWRITEAOF from +OK to a more meaningful message that makes the user aware of an operation that just started and is not yet finished.

shareobjectspoolsize implemented in reds.conf, in order to control the pool size when object sharing is on

$ make
cc -c -O2 -Wall -W -DSDS_ABORT_ON_OOM -g  adlist.c
cc -c -O2 -Wall -W -DSDS_ABORT_ON_OOM -g  ae.c
cc -c -O2 -Wall -W -DSDS_ABORT_ON_OOM -g  anet.c
cc -c -O2 -Wall -W -DSDS_ABORT_ON_OOM -g  dict.c
cc -c -O2 -Wall -W -DSDS_ABORT_ON_OOM -g  redis.c
cc -c -O2 -Wall -W -DSDS_ABORT_ON_OOM -g  sds.c
cc -c -O2 -Wall -W -DSDS_ABORT_ON_OOM -g  zmalloc.c
cc -o redis-server -O2 -Wall -W -DSDS_ABORT_ON_OOM -g adlist.o ae.o anet.o dict.o redis.o sds.o zmalloc.o

Hint: To run the test-redis.tcl script is a good idea.
Launch the redis server with ./redis-server, then in another
terminal window enter this directory and run 'make test'.

cc -c -O2 -Wall -W -DSDS_ABORT_ON_OOM -g  benchmark.c
cc -o redis-benchmark -O2 -Wall -W -DSDS_ABORT_ON_OOM -g ae.o anet.o benchmark.o sds.o adlist.o zmalloc.o
cc -c -O2 -Wall -W -DSDS_ABORT_ON_OOM -g  redis-cli.c
cc -o redis-cli -O2 -Wall -W -DSDS_ABORT_ON_OOM -g anet.o sds.o adlist.o redis-cli.o zmalloc.o

$ tail -1 redis.conf

$ ./redis-server redis.conf &
[1] 52494
$ - Server started, Redis version 0.08
- DB loaded from disk
- The server is now ready to accept connections on port 6379
. 0 clients connected (0 slaves), 1932 bytes in use

$ make test
tclsh test-redis.tcl
DEL all keys to start with a clean DB                                  . Accepted 127.0.0.1:54490
PASSED
SET and GET an item                                                    PASSED
DEL against a single item                                              PASSED
KEYS with pattern                                                      PASSED
KEYS to get all keys                                                   PASSED
DBSIZE                                                                 PASSED
DEL all keys                                                           PASSED
Very big payload in GET/SET                                            PASSED
SET 10000 numeric keys and access all them in reverse order            . DB 0: 10001 keys in 16384 slots HT.
. 1 clients connected (0 slaves), 4885707 bytes in use
PASSED
DBSIZE should be 10001 now                                             PASSED
INCR against non existing key                                          PASSED
INCR against key created by incr itself                                PASSED
INCR against key originally set with SET                               PASSED
SETNX target key missing                                               PASSED
SETNX target key exists                                                PASSED
EXISTS                                                                 PASSED
Zero length value in key. SET/GET/EXISTS                               PASSED
Commands pipelining                                                    PASSED
Non existing command                                                   PASSED
Basic LPUSH, RPUSH, LLENGTH, LINDEX                                    PASSED
DEL a list                                                             PASSED
Create a long list and check every single element with LINDEX          PASSED
Test elements with LINDEX in random access                             PASSED
LLEN against non-list value error                                      PASSED
LINDEX against non-list value error                                    PASSED
LPUSH against non-list value error                                     PASSED
RPUSH against non-list value error                                     PASSED
RENAME basic usage                                                     PASSED
RENAME source key should no longer exist                               PASSED
RENAME against already existing key                                    PASSED
RENAMENX basic usage                                                   PASSED
RENAMENX against already existing key                                  PASSED
RENAMENX against already existing key (2)                              PASSED
RENAME against non existing source key                                 PASSED
RENAME where source and dest key is the same                           PASSED
DEL all keys again (DB 0)                                              PASSED
DEL all keys again (DB 1)                                              PASSED
MOVE basic usage                                                       PASSED
MOVE against key existing in the target DB                             PASSED
SET/GET keys in different DBs                                          PASSED
Basic LPOP/RPOP                                                        PASSED
LPOP/RPOP against empty list                                           PASSED
LPOP against non list value                                            PASSED
Mass LPUSH/LPOP                                                        PASSED
LRANGE basics                                                          PASSED
LRANGE inverted indexes                                                PASSED
LRANGE out of range indexes including the full list                    PASSED
LRANGE against non existing key                                        PASSED
LTRIM basics                                                           PASSED
LSET                                                                   PASSED
LSET out of range index                                                PASSED
LSET against non existing key                                          PASSED
LSET against non list value                                            PASSED
SADD, SCARD, SISMEMBER, SMEMBERS basics                                PASSED
SADD adding the same element multiple times                            PASSED
SADD against non set                                                   PASSED
SREM basics                                                            PASSED
Mass SADD and SINTER with two sets                                     PASSED
SINTERSTORE with two sets                                              PASSED
SINTER against three sets                                              PASSED
SINTERSTORE with three sets                                            PASSED
SAVE - make sure there are all the types as values                     - DB saved on disk
PASSED
Create a random list                                                   . DB 0: 6057 keys in 16384 slots HT.
. DB 1: 3 keys in 16 slots HT.
. 1 clients connected (0 slaves), 1045147 bytes in use
PASSED
SORT with BY against the newly created list                            PASSED
SORT direct, numeric, against the newly created list                   PASSED
SORT decreasing sort                                                   PASSED
SORT speed, sorting 10000 elements list using BY, 100 times
  Average time to sort: 5.28 milliseconds PASSED
SORT speed, sorting 10000 elements list directly, 100 times
  Average time to sort: 1.53 milliseconds PASSED
SORT speed, pseudo-sorting 10000 elements list, BY <const>, 100 times
  Average time to sort: 0.47 milliseconds PASSED
SORT regression for issue #19, sorting floats                          - DB saved on disk
PASSED
LREM, remove all the occurrences                                       - DB saved on disk
PASSED
LREM, remove the first occurrence                                      PASSED
LREM, remove non existing element                                      PASSED
LREM, starting from tail with negative count                           - DB saved on disk
PASSED
LREM, starting from tail with negative count (2)                       PASSED
MGET                                                                   - DB saved on disk
PASSED
MGET against non existing key                                          PASSED
MGET against non-string key                                            PASSED
FLUSHALL                                                               - DB saved on disk
PASSED

79 tests, 79 passed, 0 failed
. Client closed connection
. 0 clients connected (0 slaves), 1347660 bytes in use

$ kill -15 %1
[1]+  Terminated              ./redis-server redis.conf

$ vim redis.conf

$ tail -1 redis.conf
requirepass foobared

$ ./redis-server redis.conf &
[1] 52518
$ - Server started, Redis version 0.08
- DB loaded from disk
- The server is now ready to accept connections on port 6379
. 0 clients connected (0 slaves), 1945 bytes in use

$ make test
tclsh test-redis.tcl
. Accepted 127.0.0.1:54492
DEL all keys to start with a clean DB

ERR operation not permitted

    while executing
"::redis::redis_read_reply $fd"
    (procedure "::redis::__dispatch__" line 13)
    invoked from within
"$r keys *"
    ("uplevel" body line 2)
    invoked from within
"uplevel 1 $code"
    (procedure "test" line 4)
    invoked from within
"test {DEL all keys to start with a clean DB} {
        foreach key [$r keys *] {$r del $key}
        $r dbsize
    } {0}"
    (procedure "main" line 13)
    invoked from within
"main 127.0.0.1 6379"
    invoked from within
"if {[llength $argv] == 0} {
    main 127.0.0.1 6379
} elseif {[llength $argv] == 1 && [lindex $argv 0] eq {stress}} {
    stress
} else {
    main [li..."
    (file "test-redis.tcl" line 630)
. Client closed connection
make: *** [test] Error 1
. 0 clients connected (0 slaves), 2041 bytes in use
. 0 clients connected (0 slaves), 2041 bytes in use

$ kill -15 %1
[1]+  Terminated              ./redis-server redis.conf

$ vim test-redis.tcl

$ git diff test-redis.tcl