1 files changed, 116 insertions, 0 deletions

diff --git a/misc/jit_perf.py b/misc/jit_perf.py
new file mode 100755
index 0000000000..bc0f961b20
--- /dev/null
+++ b/misc/jit_perf.py
@@ -0,0 +1,116 @@
+#!/usr/bin/env python3
+import os
+import sys
+from collections import Counter, defaultdict
+import os.path
+
+# Aggregating cycles per symbol and dso
+total_cycles = 0
+category_cycles = Counter()
+detailed_category_cycles = defaultdict(Counter)
+categories = set()
+
+def truncate_symbol(symbol, max_length=50):
+    """ Truncate the symbol name to a maximum length """
+    return symbol if len(symbol) <= max_length else symbol[:max_length-3] + '...'
+
+def categorize_symbol(dso, symbol):
+    """ Categorize the symbol based on the defined criteria """
+    if dso == 'sqlite3_native.so':
+        return '[sqlite3]'
+    elif 'SHA256' in symbol:
+        return '[sha256]'
+    elif symbol.startswith('[JIT] gen_send'):
+        return '[JIT send]'
+    elif symbol.startswith('[JIT]') or symbol.startswith('ZJIT: ') or dso.startswith('perf-'):
+        return '[JIT code]'
+    elif '::' in symbol or symbol.startswith('_ZN4yjit') or symbol.startswith('_ZN4zjit'):
+        return '[JIT compile]'
+    elif symbol.startswith('rb_vm_') or symbol.startswith('vm_') or symbol in {
+        "rb_call0", "callable_method_entry_or_negative", "invoke_block_from_c_bh",
+        "rb_funcallv_scope", "setup_parameters_complex", "rb_yield"}:
+        return '[interpreter]'
+    elif symbol.startswith('rb_hash_') or symbol.startswith('hash_'):
+        return '[rb_hash_*]'
+    elif symbol.startswith('rb_ary_') or symbol.startswith('ary_'):
+        return '[rb_ary_*]'
+    elif symbol.startswith('rb_str_') or symbol.startswith('str_'):
+        return '[rb_str_*]'
+    elif symbol.startswith('rb_sym') or symbol.startswith('sym_'):
+        return '[rb_sym_*]'
+    elif symbol.startswith('rb_st_') or symbol.startswith('st_'):
+        return '[rb_st_*]'
+    elif symbol.startswith('rb_ivar_') or 'shape' in symbol:
+        return '[ivars]'
+    elif 'match' in symbol or symbol.startswith('rb_reg') or symbol.startswith('onig'):
+        return '[regexp]'
+    elif 'alloc' in symbol or 'free' in symbol or 'gc' in symbol:
+        return '[GC]'
+    elif 'pthread' in symbol and 'lock' in symbol:
+        return '[pthread lock]'
+    else:
+        return symbol  # Return the symbol itself for uncategorized symbols
+
+def process_event(event):
+    global total_cycles, category_cycles, detailed_category_cycles, categories
+
+    full_dso = event.get("dso", "Unknown_dso")
+    dso = os.path.basename(full_dso)
+    symbol = event.get("symbol", "[unknown]")
+    cycles = event["sample"]["period"]
+    total_cycles += cycles
+
+    category = categorize_symbol(dso, symbol)
+    category_cycles[category] += cycles
+    detailed_category_cycles[category][(dso, symbol)] += cycles
+
+    if category.startswith('[') and category.endswith(']'):
+        categories.add(category)
+
+def trace_end():
+    if total_cycles == 0:
+        return
+
+    print("Aggregated Event Data:")
+    print("{:<20} {:<50} {:>20} {:>15}".format("[dso]", "[symbol or category]", "[top-most cycle ratio]", "[num cycles]"))
+
+    for category, cycles in category_cycles.most_common():
+        ratio = (cycles / total_cycles) * 100
+        dsos = {dso for dso, _ in detailed_category_cycles[category]}
+        dso_display = next(iter(dsos)) if len(dsos) == 1 else "Multiple DSOs"
+        print("{:<20} {:<50} {:>20.2f}% {:>15}".format(dso_display, truncate_symbol(category), ratio, cycles))
+
+    # Category breakdown
+    for category in categories:
+        symbols = detailed_category_cycles[category]
+        category_total = sum(symbols.values())
+        category_ratio = (category_total / total_cycles) * 100
+        print(f"\nCategory: {category} ({category_ratio:.2f}%)")
+        print("{:<20} {:<50} {:>20} {:>15}".format("[dso]", "[symbol]", "[top-most cycle ratio]", "[num cycles]"))
+        for (dso, symbol), cycles in symbols.most_common():
+            symbol_ratio = (cycles / category_total) * 100
+            print("{:<20} {:<50} {:>20.2f}% {:>15}".format(dso, truncate_symbol(symbol), symbol_ratio, cycles))
+
+# There are two ways to use this script:
+# 1) perf script -s misc/yjit_perf.py                     -- native interface
+# 2) perf script > perf.txt && misc/yjit_perf.py perf.txt -- hack, which doesn't require perf with Python support
+#
+# In both cases, __name__ is "__main__". The following code implements (2) when sys.argv is 2.
+if __name__ == "__main__" and len(sys.argv) == 2:
+    if len(sys.argv) != 2:
+        print("Usage: yjit_perf.py <filename>")
+        sys.exit(1)
+
+    with open(sys.argv[1], "r") as file:
+        for line in file:
+            # [Example]
+            # ruby 78207 3482.848465: 1212775 cpu_core/cycles:P/: 5c0333f682e1 [JIT] getlocal_WC_0+0x0 (/tmp/perf-78207.map)
+            row = line.split(maxsplit=6)
+
+            period = row[3] # "1212775"
+            symbol, dso = row[6].rsplit(" (", 1) # "[JIT] getlocal_WC_0+0x0", "/tmp/perf-78207.map)\n"
+            symbol = symbol.split("+")[0] # "[JIT] getlocal_WC_0"
+            dso = dso.split(")")[0] # "/tmp/perf-78207.map"
+
+            process_event({"dso": dso, "symbol": symbol, "sample": {"period": int(period)}})
+    trace_end()