[ruby/rack] Use autotune for database connections

Decrease the KB_PER_WORKER as this is a small application. +--------+---------+------+------+-----+-----+-------+--------------+ |threads |plaintext|update| json| db|query|fortune|weighted_score| +--------+---------+------+------+-----+-----+-------+--------------+ | 32| 145031| 11936|122017|27001|18156| 23712| 1500| | 2| 126527| 11878|141483|33525|20515| 27725| 1591| | 1| 126701| 12923|133573|31402|19468| 24894| 1617| | 5| 34445| 15098|103356|29189|23860| 22518| 1802| | 5| 34440| 16363|114751|29820|20933| 24349| 1845| +--------+---------+------+------+-----+-----+-------+--------------+
TechEmpower · May 4, 2024 · 884b8d1 · 884b8d1
1 parent 034d6fb
commit 884b8d1
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Showing 3 changed files with 9 additions and 4 deletions.
diff --git a/frameworks/Ruby/rack/config/auto_tune.rb b/frameworks/Ruby/rack/config/auto_tune.rb
@@ -7,7 +7,7 @@
 # MAX_THREADS, add threads per process to reach MAX_THREADS.
 require 'etc'
 
-KB_PER_WORKER = 128 * 1_024 # average of peak PSS of single-threaded processes (watch smem -k)
+KB_PER_WORKER = 64 * 1_024 # average of peak PSS of single-threaded processes (watch smem -k)
 MIN_WORKERS = 2
 MAX_WORKERS_PER_VCPU = 1.25 # virtual/logical
 MIN_THREADS_PER_WORKER = 1

diff --git a/frameworks/Ruby/rack/config/puma.rb b/frameworks/Ruby/rack/config/puma.rb
@@ -6,7 +6,7 @@
 
 # FWBM only... use the puma_auto_tune gem in production!
 num_workers, num_threads = auto_tune
-
+num_threads = [num_threads, 32].min
 
 before_fork do
   Sequel::DATABASES.each(&:disconnect)

diff --git a/frameworks/Ruby/rack/hello_world.rb b/frameworks/Ruby/rack/hello_world.rb
@@ -54,8 +54,13 @@ class HelloWorld
   </html>'
 
   def initialize
-    # auto_tune
-    max_connections = 512
+    if defined?(Puma)
+      num_workers, num_threads = auto_tune
+      num_threads = [num_threads, 32].min
+      max_connections = num_workers * num_threads
+    else
+      max_connections = 512
+    end
     @db = PgDb.new(DEFAULT_DATABASE_URL, max_connections)
   end