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proc test_memory_efficiency {range} {
r flushall
set rd [redis_deferring_client]
set base_mem [s used_memory]
set written 0
for {set j 0} {$j < 10000} {incr j} {
set key key:$j
set val [string repeat A [expr {int(rand()*$range)}]]
$rd set $key $val
incr written [string length $key]
incr written [string length $val]
incr written 2 ;# A separator is the minimum to store key-value data.
}
for {set j 0} {$j < 10000} {incr j} {
$rd read ; # Discard replies
}
set current_mem [s used_memory]
set used [expr {$current_mem-$base_mem}]
set efficiency [expr {double($written)/$used}]
return $efficiency
}
start_server {tags {"memefficiency"}} {
foreach {size_range expected_min_efficiency} {
32 0.15
64 0.25
128 0.35
1024 0.75
16384 0.82
} {
test "Memory efficiency with values in range $size_range" {
set efficiency [test_memory_efficiency $size_range]
assert {$efficiency >= $expected_min_efficiency}
}
}
}
if 0 {
start_server {tags {"defrag"}} {
if {[string match {*jemalloc*} [s mem_allocator]]} {
test "Active defrag" {
r config set activedefrag no
r config set active-defrag-threshold-lower 5
r config set active-defrag-ignore-bytes 2mb
r config set maxmemory 100mb
r config set maxmemory-policy allkeys-lru
r debug populate 700000 asdf 150
r debug populate 170000 asdf 300
set frag [s mem_fragmentation_ratio]
assert {$frag >= 1.7}
r config set activedefrag yes
after 1500 ;# active defrag tests the status once a second.
set hits [s active_defrag_hits]
# wait for the active defrag to stop working
set tries 0
while { True } {
incr tries
after 500
set prev_hits $hits
set hits [s active_defrag_hits]
if {$hits == $prev_hits} {
break
}
assert {$tries < 100}
}
# TODO: we need to expose more accurate fragmentation info
# i.e. the allocator used and active pages
# instead we currently look at RSS so we need to ask for purge
r memory purge
# Test the the fragmentation is lower and that the defragger
# stopped working
set frag [s mem_fragmentation_ratio]
assert {$frag < 1.55}
set misses [s active_defrag_misses]
after 500
set misses2 [s active_defrag_misses]
assert {$misses2 == $misses}
}
}
}
}
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