From c5aeac6898f819fb4c9c2289367f816081819823 Mon Sep 17 00:00:00 2001
From: Lex Berezhny <lex@damoti.com>
Date: Thu, 11 Jul 2019 20:10:28 -0400
Subject: [PATCH] sqlite performance script measures sql time inside each
 process individually

---
 lbry/scripts/sqlite_perf_test.py | 95 ++++++++++++++++++--------------
 1 file changed, 53 insertions(+), 42 deletions(-)

diff --git a/lbry/scripts/sqlite_perf_test.py b/lbry/scripts/sqlite_perf_test.py
index 8dd7b0c56..8dd620e65 100644
--- a/lbry/scripts/sqlite_perf_test.py
+++ b/lbry/scripts/sqlite_perf_test.py
@@ -1,4 +1,4 @@
-import asyncio, sqlite3, time
+import uvloop, asyncio, sqlite3, time, sys
 from concurrent.futures import ProcessPoolExecutor
 from contextvars import ContextVar
 
@@ -14,59 +14,70 @@ def init():
 
 def reader():
     conn = db.get()
-    for _ in range(1):
-        conn.execute("""
-            SELECT 
-                claimtrie.claim_hash as is_controlling,
-                claimtrie.last_take_over_height,
-                claim.claim_hash, claim.txo_hash,
-                claim.claims_in_channel,
-                claim.height, claim.creation_height,
-                claim.activation_height, claim.expiration_height,
-                claim.effective_amount, claim.support_amount,
-                claim.trending_group, claim.trending_mixed,
-                claim.trending_local, claim.trending_global,
-                claim.short_url, claim.canonical_url,
-                claim.channel_hash, channel.txo_hash AS channel_txo_hash,
-                channel.height AS channel_height, claim.signature_valid
-            FROM claim
-                LEFT JOIN claimtrie USING (claim_hash)
-                LEFT JOIN claim as channel ON (claim.channel_hash=channel.claim_hash)
-            WHERE 
-                EXISTS(
-                    SELECT 1 FROM tag WHERE claim.claim_hash=tag.claim_hash
-                    AND tag IN ('alexandria ocasio-cortez', 'Alien', 'alt news', 'art', 'audio',
-                    'automotive', 'beliefs', 'blockchain', 'dog grooming', 'economics', 'food',
-                    'learning', 'mature', 'nature', 'news', 'physics', 'science', 'technology')
-                )
-                AND NOT EXISTS(
-                    SELECT 1 FROM tag WHERE claim.claim_hash=tag.claim_hash AND tag IN ('nsfw', 'xxx', 'mature')
-                )
-            ORDER BY claim.height DESC, claim.normalized ASC
-            LIMIT 20 OFFSET 100
-        """).fetchall()
+    start = time.time()
+    conn.execute("""
+        SELECT 
+            claimtrie.claim_hash as is_controlling,
+            claimtrie.last_take_over_height,
+            claim.claim_hash, claim.txo_hash,
+            claim.claims_in_channel,
+            claim.height, claim.creation_height,
+            claim.activation_height, claim.expiration_height,
+            claim.effective_amount, claim.support_amount,
+            claim.trending_group, claim.trending_mixed,
+            claim.trending_local, claim.trending_global,
+            claim.short_url, claim.canonical_url,
+            claim.channel_hash, channel.txo_hash AS channel_txo_hash,
+            channel.height AS channel_height, claim.signature_valid
+        FROM claim
+            LEFT JOIN claimtrie USING (claim_hash)
+            LEFT JOIN claim as channel ON (claim.channel_hash=channel.claim_hash)
+        WHERE 
+            EXISTS(
+                SELECT 1 FROM tag WHERE claim.claim_hash=tag.claim_hash
+                AND tag IN ('alexandria ocasio-cortez', 'Alien', 'alt news', 'art', 'audio',
+                'automotive', 'beliefs', 'blockchain', 'dog grooming', 'economics', 'food',
+                'learning', 'mature', 'nature', 'news', 'physics', 'science', 'technology')
+            )
+            AND NOT EXISTS(
+                SELECT 1 FROM tag WHERE claim.claim_hash=tag.claim_hash AND tag IN ('nsfw', 'xxx', 'mature')
+            )
+        ORDER BY claim.height DESC, claim.normalized ASC
+        LIMIT 20 OFFSET 100
+    """).fetchall()
+    elapsed = time.time() - start
+    return elapsed
 
 
 async def run_times(executor, iterations, show=True):
     start = time.time()
-    await asyncio.gather(*(asyncio.get_running_loop().run_in_executor(executor, reader) for _ in range(iterations)))
-    elapsed = time.time() - start
+    timings = await asyncio.gather(*(
+        asyncio.get_running_loop().run_in_executor(executor, reader) for _ in range(iterations)
+    ))
+    total = time.time() - start
     if show:
-        print(f"{iterations:3}: {elapsed:.5f}ms total, {elapsed/iterations:.5f}ms/query")
+        avg = sum(timings)/len(timings)
+        print(f"{iterations:4}: {total:.5f}ms total concurrent, {len(timings)*avg:.5f}ms total sequential (avg*runs)")
+        print(f"      {total/len(timings):.5f}ms/query concurrent (total/runs)")
+        print(f"      {avg:.5f}ms/query actual average (sum(queries)/runs)")
+        sys.stdout.write('      sample:')
+        for i, t in zip(range(10), timings[::-1]):
+            sys.stdout.write(f' {t:.5f}ms')
+        print(' ...\n' if len(timings) > 10 else '\n')
 
 
 async def main():
     executor = ProcessPoolExecutor(4, initializer=init)
     await run_times(executor, 4, show=False)
     await run_times(executor, 1)
-    await run_times(executor, 4)
-    await run_times(executor, 8)
-    await run_times(executor, 16)
-    await run_times(executor, 32)
-    await run_times(executor, 64)
-    await run_times(executor, 128)
-    await run_times(executor, 256)
+    await run_times(executor, 2**3)
+    await run_times(executor, 2**5)
+    await run_times(executor, 2**7)
+    await run_times(executor, 2**9)
+    await run_times(executor, 2**11)
+    await run_times(executor, 2**13)
     executor.shutdown(True)
 
 if __name__ == '__main__':
+    uvloop.install()
     asyncio.run(main())