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Os Syscall Strace

DodaTech 1 min read

In this tutorial, you'll learn about How to Fix strace Overhead Errors. We cover key concepts, practical examples, and best practices.

Fix strace overhead errors when strace on every syscall slows process 10-100x.

Quick Fix

Wrong

import os, subprocess
# Running with strace:
# strace -f python script.py
# Every syscall: ptrace stop, read registers, format string, output, ptrace continue
# pid=os.fork()  # strace ~1us, normal ~0.1us... actually bigger difference

strace adds 10-100x overhead per syscall. 1000 syscalls = 1000 slowdown.

import os
# Don't strace. Use perf for profiling:
# perf stat -e syscalls:sys_enter_read ./python script.py
# Or use strace -c for summary:
# strace -c python script.py  # summarize, ~1% overhead
# Or use strace -e trace=network (trace only certain syscalls):
# strace -e trace=network python server.py
# For Python, use trace module:
import trace
tracer=trace.Trace(count=True,trace=False)
tracer.run('open("/tmp/test","w").close()')
results=tracer.results()
results.show_count()

strace -c provides summary without per-syscall overhead. perf stat for profiling.

Prevention

strace adds 10-100x overhead. Use -c for summary or perf for profiling.

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FAQ

What is strace?

Syscall tracer. ptrace-based. Intercepts every syscall entry/exit.

Why slow?

ptrace stop + context switch per syscall. 10-100x slower. Not for production.

Alternatives?

perf trace, bpftrace, sysdig. Lower overhead. perf stat --syscall.

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