#!/usr/bin/env python3
import subprocess,time
n=1000
t=time.time()
s=''.join(str(10**18 i) '\n' for i in range(n))
p=subprocess.run(['/usr/bin/factor'],input=s,text=True,capture_output=True,timeout=7)
print('n',n,'secs',time.time()-t,'lines',len(p.stdout.splitlines()),'err',p.stderr[:100])