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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 external:skip"}} {
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 >= $expected_min_efficiency}
}
}
}
run_solo {defrag} {
start_server {tags {"defrag external:skip"} overrides {appendonly yes auto-aof-rewrite-percentage 0 save ""}} {
if {[string match {*jemalloc*} [s mem_allocator]] && [r debug mallctl arenas.page] <= 8192} {
test "Active defrag" {
r config set hz 100
r config set activedefrag no
r config set active-defrag-threshold-lower 5
r config set active-defrag-cycle-min 65
r config set active-defrag-cycle-max 75
r config set active-defrag-ignore-bytes 2mb
r config set maxmemory 100mb
r config set maxmemory-policy allkeys-lru
populate 700000 asdf1 150
populate 170000 asdf2 300
after 120 ;# serverCron only updates the info once in 100ms
set frag [s allocator_frag_ratio]
if {$::verbose} {
puts "frag $frag"
}
assert {$frag >= 1.4}
r config set latency-monitor-threshold 5
r latency reset
r config set maxmemory 110mb ;# prevent further eviction (not to fail the digest test)
set digest [debug_digest]
catch {r config set activedefrag yes} e
if {[r config get activedefrag] eq "activedefrag yes"} {
# Wait for the active defrag to start working (decision once a
# second).
wait_for_condition 50 100 {
[s active_defrag_running] ne 0
} else {
fail "defrag not started."
}
# Wait for the active defrag to stop working.
wait_for_condition 2000 100 {
[s active_defrag_running] eq 0
} else {
after 120 ;# serverCron only updates the info once in 100ms
puts [r info memory]
puts [r memory malloc-stats]
fail "defrag didn't stop."
}
# Test the fragmentation is lower.
after 120 ;# serverCron only updates the info once in 100ms
set frag [s allocator_frag_ratio]
set max_latency 0
foreach event [r latency latest] {
lassign $event eventname time latency max
if {$eventname == "active-defrag-cycle"} {
set max_latency $max
}
}
if {$::verbose} {
puts "frag $frag"
set misses [s active_defrag_misses]
set hits [s active_defrag_hits]
puts "hits: $hits"
puts "misses: $misses"
puts "max latency $max_latency"
puts [r latency latest]
puts [r latency history active-defrag-cycle]
}
assert {$frag < 1.1}
# due to high fragmentation, 100hz, and active-defrag-cycle-max set to 75,
# we expect max latency to be not much higher than 7.5ms but due to rare slowness threshold is set higher
if {!$::no_latency} {
assert {$max_latency <= 30}
}
}
# verify the data isn't corrupted or changed
set newdigest [debug_digest]
assert {$digest eq $newdigest}
r save ;# saving an rdb iterates over all the data / pointers
# if defrag is supported, test AOF loading too
if {[r config get activedefrag] eq "activedefrag yes"} {
test "Active defrag - AOF loading" {
# reset stats and load the AOF file
r config resetstat
r config set key-load-delay -25 ;# sleep on average 1/25 usec
r debug loadaof
r config set activedefrag no
# measure hits and misses right after aof loading
set misses [s active_defrag_misses]
set hits [s active_defrag_hits]
after 120 ;# serverCron only updates the info once in 100ms
set frag [s allocator_frag_ratio]
set max_latency 0
foreach event [r latency latest] {
lassign $event eventname time latency max
if {$eventname == "while-blocked-cron"} {
set max_latency $max
}
}
if {$::verbose} {
puts "AOF loading:"
puts "frag $frag"
puts "hits: $hits"
puts "misses: $misses"
puts "max latency $max_latency"
puts [r latency latest]
puts [r latency history "while-blocked-cron"]
}
# make sure we had defrag hits during AOF loading
assert {$hits > 100000}
# make sure the defragger did enough work to keep the fragmentation low during loading.
# we cannot check that it went all the way down, since we don't wait for full defrag cycle to complete.
assert {$frag < 1.4}
# since the AOF contains simple (fast) SET commands (and the cron during loading runs every 1024 commands),
# it'll still not block the loading for long periods of time.
if {!$::no_latency} {
assert {$max_latency <= 40}
}
}
} ;# Active defrag - AOF loading
}
r config set appendonly no
r config set key-load-delay 0
test "Active defrag eval scripts" {
r flushdb
r script flush sync
r config resetstat
r config set hz 100
r config set activedefrag no
r config set active-defrag-threshold-lower 5
r config set active-defrag-cycle-min 65
r config set active-defrag-cycle-max 75
r config set active-defrag-ignore-bytes 1500kb
r config set maxmemory 0
set n 50000
# Populate memory with interleaving script-key pattern of same size
set dummy_script "--[string repeat x 400]\nreturn "
set rd [redis_deferring_client]
for {set j 0} {$j < $n} {incr j} {
set val "$dummy_script[format "%06d" $j]"
$rd script load $val
$rd set k$j $val
}
for {set j 0} {$j < $n} {incr j} {
$rd read ; # Discard script load replies
$rd read ; # Discard set replies
}
after 120 ;# serverCron only updates the info once in 100ms
if {$::verbose} {
puts "used [s allocator_allocated]"
puts "rss [s allocator_active]"
puts "frag [s allocator_frag_ratio]"
puts "frag_bytes [s allocator_frag_bytes]"
}
assert_lessthan [s allocator_frag_ratio] 1.05
# Delete all the keys to create fragmentation
for {set j 0} {$j < $n} {incr j} { $rd del k$j }
for {set j 0} {$j < $n} {incr j} { $rd read } ; # Discard del replies
$rd close
after 120 ;# serverCron only updates the info once in 100ms
if {$::verbose} {
puts "used [s allocator_allocated]"
puts "rss [s allocator_active]"
puts "frag [s allocator_frag_ratio]"
puts "frag_bytes [s allocator_frag_bytes]"
}
assert_morethan [s allocator_frag_ratio] 1.4
catch {r config set activedefrag yes} e
if {[r config get activedefrag] eq "activedefrag yes"} {
# wait for the active defrag to start working (decision once a second)
wait_for_condition 50 100 {
[s active_defrag_running] ne 0
} else {
fail "defrag not started."
}
# wait for the active defrag to stop working
wait_for_condition 500 100 {
[s active_defrag_running] eq 0
} else {
after 120 ;# serverCron only updates the info once in 100ms
puts [r info memory]
puts [r memory malloc-stats]
fail "defrag didn't stop."
}
# test the fragmentation is lower
after 120 ;# serverCron only updates the info once in 100ms
if {$::verbose} {
puts "used [s allocator_allocated]"
puts "rss [s allocator_active]"
puts "frag [s allocator_frag_ratio]"
puts "frag_bytes [s allocator_frag_bytes]"
}
assert_lessthan_equal [s allocator_frag_ratio] 1.05
}
# Flush all script to make sure we don't crash after defragging them
r script flush sync
} {OK}
test "Active defrag big keys" {
r flushdb
r config resetstat
r config set hz 100
r config set activedefrag no
r config set active-defrag-max-scan-fields 1000
r config set active-defrag-threshold-lower 5
r config set active-defrag-cycle-min 65
r config set active-defrag-cycle-max 75
r config set active-defrag-ignore-bytes 2mb
r config set maxmemory 0
r config set list-max-ziplist-size 5 ;# list of 10k items will have 2000 quicklist nodes
r config set stream-node-max-entries 5
r hmset hash h1 v1 h2 v2 h3 v3
r lpush list a b c d
r zadd zset 0 a 1 b 2 c 3 d
r sadd set a b c d
r xadd stream * item 1 value a
r xadd stream * item 2 value b
r xgroup create stream mygroup 0
r xreadgroup GROUP mygroup Alice COUNT 1 STREAMS stream >
# create big keys with 10k items
set rd [redis_deferring_client]
for {set j 0} {$j < 10000} {incr j} {
$rd hset bighash $j [concat "asdfasdfasdf" $j]
$rd lpush biglist [concat "asdfasdfasdf" $j]
$rd zadd bigzset $j [concat "asdfasdfasdf" $j]
$rd sadd bigset [concat "asdfasdfasdf" $j]
$rd xadd bigstream * item 1 value a
}
for {set j 0} {$j < 50000} {incr j} {
$rd read ; # Discard replies
}
set expected_frag 1.7
if {$::accurate} {
# scale the hash to 1m fields in order to have a measurable the latency
for {set j 10000} {$j < 1000000} {incr j} {
$rd hset bighash $j [concat "asdfasdfasdf" $j]
}
for {set j 10000} {$j < 1000000} {incr j} {
$rd read ; # Discard replies
}
# creating that big hash, increased used_memory, so the relative frag goes down
set expected_frag 1.3
}
# add a mass of string keys
for {set j 0} {$j < 500000} {incr j} {
$rd setrange $j 150 a
}
for {set j 0} {$j < 500000} {incr j} {
$rd read ; # Discard replies
}
assert_equal [r dbsize] 500010
# create some fragmentation
for {set j 0} {$j < 500000} {incr j 2} {
$rd del $j
}
for {set j 0} {$j < 500000} {incr j 2} {
$rd read ; # Discard replies
}
assert_equal [r dbsize] 250010
# start defrag
after 120 ;# serverCron only updates the info once in 100ms
set frag [s allocator_frag_ratio]
if {$::verbose} {
puts "frag $frag"
}
assert {$frag >= $expected_frag}
r config set latency-monitor-threshold 5
r latency reset
set digest [debug_digest]
catch {r config set activedefrag yes} e
if {[r config get activedefrag] eq "activedefrag yes"} {
# wait for the active defrag to start working (decision once a second)
wait_for_condition 50 100 {
[s active_defrag_running] ne 0
} else {
fail "defrag not started."
}
# wait for the active defrag to stop working
wait_for_condition 500 100 {
[s active_defrag_running] eq 0
} else {
after 120 ;# serverCron only updates the info once in 100ms
puts [r info memory]
puts [r memory malloc-stats]
fail "defrag didn't stop."
}
# test the fragmentation is lower
after 120 ;# serverCron only updates the info once in 100ms
set frag [s allocator_frag_ratio]
set max_latency 0
foreach event [r latency latest] {
lassign $event eventname time latency max
if {$eventname == "active-defrag-cycle"} {
set max_latency $max
}
}
if {$::verbose} {
puts "frag $frag"
set misses [s active_defrag_misses]
set hits [s active_defrag_hits]
puts "hits: $hits"
puts "misses: $misses"
puts "max latency $max_latency"
puts [r latency latest]
puts [r latency history active-defrag-cycle]
}
assert {$frag < 1.1}
# due to high fragmentation, 100hz, and active-defrag-cycle-max set to 75,
# we expect max latency to be not much higher than 7.5ms but due to rare slowness threshold is set higher
if {!$::no_latency} {
assert {$max_latency <= 30}
}
}
# verify the data isn't corrupted or changed
set newdigest [debug_digest]
assert {$digest eq $newdigest}
r save ;# saving an rdb iterates over all the data / pointers
} {OK}
test "Active defrag big list" {
r flushdb
r config resetstat
r config set hz 100
r config set activedefrag no
r config set active-defrag-max-scan-fields 1000
r config set active-defrag-threshold-lower 5
r config set active-defrag-cycle-min 65
r config set active-defrag-cycle-max 75
r config set active-defrag-ignore-bytes 2mb
r config set maxmemory 0
r config set list-max-ziplist-size 5 ;# list of 500k items will have 100k quicklist nodes
# create big keys with 10k items
set rd [redis_deferring_client]
set expected_frag 1.7
# add a mass of list nodes to two lists (allocations are interlaced)
set val [string repeat A 100] ;# 5 items of 100 bytes puts us in the 640 bytes bin, which has 32 regs, so high potential for fragmentation
set elements 500000
for {set j 0} {$j < $elements} {incr j} {
$rd lpush biglist1 $val
$rd lpush biglist2 $val
}
for {set j 0} {$j < $elements} {incr j} {
$rd read ; # Discard replies
$rd read ; # Discard replies
}
# create some fragmentation
r del biglist2
# start defrag
after 120 ;# serverCron only updates the info once in 100ms
set frag [s allocator_frag_ratio]
if {$::verbose} {
puts "frag $frag"
}
assert {$frag >= $expected_frag}
r config set latency-monitor-threshold 5
r latency reset
set digest [debug_digest]
catch {r config set activedefrag yes} e
if {[r config get activedefrag] eq "activedefrag yes"} {
# wait for the active defrag to start working (decision once a second)
wait_for_condition 50 100 {
[s active_defrag_running] ne 0
} else {
fail "defrag not started."
}
# wait for the active defrag to stop working
wait_for_condition 500 100 {
[s active_defrag_running] eq 0
} else {
after 120 ;# serverCron only updates the info once in 100ms
puts [r info memory]
puts [r info stats]
puts [r memory malloc-stats]
fail "defrag didn't stop."
}
# test the fragmentation is lower
after 120 ;# serverCron only updates the info once in 100ms
set misses [s active_defrag_misses]
set hits [s active_defrag_hits]
set frag [s allocator_frag_ratio]
set max_latency 0
foreach event [r latency latest] {
lassign $event eventname time latency max
if {$eventname == "active-defrag-cycle"} {
set max_latency $max
}
}
if {$::verbose} {
puts "frag $frag"
puts "misses: $misses"
puts "hits: $hits"
puts "max latency $max_latency"
puts [r latency latest]
puts [r latency history active-defrag-cycle]
}
assert {$frag < 1.1}
# due to high fragmentation, 100hz, and active-defrag-cycle-max set to 75,
# we expect max latency to be not much higher than 7.5ms but due to rare slowness threshold is set higher
if {!$::no_latency} {
assert {$max_latency <= 30}
}
# in extreme cases of stagnation, we see over 20m misses before the tests aborts with "defrag didn't stop",
# in normal cases we only see 100k misses out of 500k elements
assert {$misses < $elements}
}
# verify the data isn't corrupted or changed
set newdigest [debug_digest]
assert {$digest eq $newdigest}
r save ;# saving an rdb iterates over all the data / pointers
r del biglist1 ;# coverage for quicklistBookmarksClear
} {1}
test "Active defrag edge case" {
# there was an edge case in defrag where all the slabs of a certain bin are exact the same
# % utilization, with the exception of the current slab from which new allocations are made
# if the current slab is lower in utilization the defragger would have ended up in stagnation,
# kept running and not move any allocation.
# this test is more consistent on a fresh server with no history
start_server {tags {"defrag"} overrides {save ""}} {
r flushdb
r config resetstat
r config set hz 100
r config set activedefrag no
r config set active-defrag-max-scan-fields 1000
r config set active-defrag-threshold-lower 5
r config set active-defrag-cycle-min 65
r config set active-defrag-cycle-max 75
r config set active-defrag-ignore-bytes 1mb
r config set maxmemory 0
set expected_frag 1.3
r debug mallctl-str thread.tcache.flush VOID
# fill the first slab containin 32 regs of 640 bytes.
for {set j 0} {$j < 32} {incr j} {
r setrange "_$j" 600 x
r debug mallctl-str thread.tcache.flush VOID
}
# add a mass of keys with 600 bytes values, fill the bin of 640 bytes which has 32 regs per slab.
set rd [redis_deferring_client]
set keys 640000
for {set j 0} {$j < $keys} {incr j} {
$rd setrange $j 600 x
}
for {set j 0} {$j < $keys} {incr j} {
$rd read ; # Discard replies
}
# create some fragmentation of 50%
set sent 0
for {set j 0} {$j < $keys} {incr j 1} {
$rd del $j
incr sent
incr j 1
}
for {set j 0} {$j < $sent} {incr j} {
$rd read ; # Discard replies
}
# create higher fragmentation in the first slab
for {set j 10} {$j < 32} {incr j} {
r del "_$j"
}
# start defrag
after 120 ;# serverCron only updates the info once in 100ms
set frag [s allocator_frag_ratio]
if {$::verbose} {
puts "frag $frag"
}
assert {$frag >= $expected_frag}
set digest [debug_digest]
catch {r config set activedefrag yes} e
if {[r config get activedefrag] eq "activedefrag yes"} {
# wait for the active defrag to start working (decision once a second)
wait_for_condition 50 100 {
[s active_defrag_running] ne 0
} else {
fail "defrag not started."
}
# wait for the active defrag to stop working
wait_for_condition 500 100 {
[s active_defrag_running] eq 0
} else {
after 120 ;# serverCron only updates the info once in 100ms
puts [r info memory]
puts [r info stats]
puts [r memory malloc-stats]
fail "defrag didn't stop."
}
# test the fragmentation is lower
after 120 ;# serverCron only updates the info once in 100ms
set misses [s active_defrag_misses]
set hits [s active_defrag_hits]
set frag [s allocator_frag_ratio]
if {$::verbose} {
puts "frag $frag"
puts "hits: $hits"
puts "misses: $misses"
}
assert {$frag < 1.1}
assert {$misses < 10000000} ;# when defrag doesn't stop, we have some 30m misses, when it does, we have 2m misses
}
# verify the data isn't corrupted or changed
set newdigest [debug_digest]
assert {$digest eq $newdigest}
r save ;# saving an rdb iterates over all the data / pointers
}
}
}
}
} ;# run_solo
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