cat-ena

matteo@turbo:/tmp$ cat= ; for i in {1..100}; do cat="|cat $cat"; echo $i:; time sh -c "cat linux-4.16.1.tar.xz $cat >/dev/null"; done
1:

real 0m0,084s
user 0m0,004s
sys 0m0,103s
2:

real 0m0,030s
user 0m0,020s
sys 0m0,033s
3:

real 0m0,027s
user 0m0,001s
sys 0m0,065s
4:

real 0m0,029s
user 0m0,019s
sys 0m0,066s
5:

real 0m0,033s
user 0m0,020s
sys 0m0,096s
6:

real 0m0,031s
user 0m0,007s
sys 0m0,121s
7:

real 0m0,033s
user 0m0,018s
sys 0m0,133s
8:

real 0m0,038s
user 0m0,012s
sys 0m0,172s
9:

real 0m0,042s
user 0m0,013s
sys 0m0,201s
10:

real 0m0,044s
user 0m0,001s
sys 0m0,238s
11:

real 0m0,046s
user 0m0,001s
sys 0m0,263s
12:

real 0m0,051s
user 0m0,006s
sys 0m0,281s
13:

real 0m0,052s
user 0m0,009s
sys 0m0,301s
14:

real 0m0,055s
user 0m0,039s
sys 0m0,295s
15:

real 0m0,058s
user 0m0,023s
sys 0m0,330s
16:

real 0m0,064s
user 0m0,046s
sys 0m0,321s
17:

real 0m0,063s
user 0m0,060s
sys 0m0,338s
18:

real 0m0,065s
user 0m0,013s
sys 0m0,408s
19:

real 0m0,066s
user 0m0,055s
sys 0m0,391s
20:

real 0m0,068s
user 0m0,095s
sys 0m0,370s
21:

real 0m0,070s
user 0m0,050s
sys 0m0,435s
22:

real 0m0,079s
user 0m0,054s
sys 0m0,455s
23:

real 0m0,077s
user 0m0,068s
sys 0m0,461s
24:

real 0m0,081s
user 0m0,053s
sys 0m0,510s
25:

real 0m0,082s
user 0m0,090s
sys 0m0,493s
26:

real 0m0,085s
user 0m0,092s
sys 0m0,518s
27:

real 0m0,089s
user 0m0,114s
sys 0m0,515s
28:

real 0m0,092s
user 0m0,100s
sys 0m0,557s
29:

real 0m0,096s
user 0m0,019s
sys 0m0,669s
30:

real 0m0,098s
user 0m0,145s
sys 0m0,571s
31:

real 0m0,105s
user 0m0,041s
sys 0m0,723s
32:

real 0m0,109s
user 0m0,163s
sys 0m0,623s
33:

real 0m0,118s
user 0m0,132s
sys 0m0,695s
34:

real 0m0,114s
user 0m0,100s
sys 0m0,739s
35:

real 0m0,118s
user 0m0,137s
sys 0m0,740s
36:

real 0m0,130s
user 0m0,107s
sys 0m0,849s
37:

real 0m0,132s
user 0m0,125s
sys 0m0,853s
38:

real 0m0,134s
user 0m0,031s
sys 0m0,985s
39:

real 0m0,144s
user 0m0,139s
sys 0m0,938s
40:

real 0m0,156s
user 0m0,114s
sys 0m1,012s
41:

real 0m0,155s
user 0m0,080s
sys 0m1,080s
42:

real 0m0,167s
user 0m0,117s
sys 0m1,136s
43:

real 0m0,168s
user 0m0,144s
sys 0m1,127s
44:

real 0m0,179s
user 0m0,121s
sys 0m1,238s
45:

real 0m0,194s
user 0m0,133s
sys 0m1,317s
46:

real 0m0,202s
user 0m0,135s
sys 0m1,329s
47:

real 0m0,213s
user 0m0,130s
sys 0m1,496s
48:

real 0m0,211s
user 0m0,136s
sys 0m1,480s
49:

real 0m0,224s
user 0m0,139s
sys 0m1,502s
50:

real 0m0,232s
user 0m0,112s
sys 0m1,642s
51:

real 0m0,223s
user 0m0,182s
sys 0m1,512s
52:

real 0m0,234s
user 0m0,079s
sys 0m1,715s
53:

real 0m0,267s
user 0m0,131s
sys 0m1,910s
54:

real 0m0,288s
user 0m0,153s
sys 0m2,022s
55:

real 0m0,267s
user 0m0,180s
sys 0m1,857s
56:

real 0m0,301s
user 0m0,135s
sys 0m2,196s
57:

real 0m0,383s
user 0m0,095s
sys 0m2,161s
58:

real 0m0,369s
user 0m0,220s
sys 0m2,007s
59:

real 0m0,344s
user 0m0,123s
sys 0m2,188s
60:

real 0m0,360s
user 0m0,224s
sys 0m2,388s
61:

real 0m0,354s
user 0m0,162s
sys 0m2,528s
62:

real 0m0,355s
user 0m0,191s
sys 0m2,553s
63:

real 0m0,386s
user 0m0,229s
sys 0m2,740s
64:

real 0m0,384s
user 0m0,179s
sys 0m2,788s
65:

real 0m0,412s
user 0m0,139s
sys 0m3,032s
66:

real 0m0,442s
user 0m0,157s
sys 0m2,906s
67:

real 0m0,418s
user 0m0,125s
sys 0m3,069s
68:

real 0m0,421s
user 0m0,242s
sys 0m2,972s
69:

real 0m0,446s
user 0m0,213s
sys 0m3,255s
70:

real 0m0,452s
user 0m0,239s
sys 0m3,195s
71:

real 0m0,463s
user 0m0,258s
sys 0m3,340s
72:

real 0m0,437s
user 0m0,239s
sys 0m3,152s
73:

real 0m0,463s
user 0m0,227s
sys 0m3,204s
74:

real 0m0,518s
user 0m0,169s
sys 0m3,310s
75:

real 0m0,475s
user 0m0,370s
sys 0m3,273s
76:

real 0m0,537s
user 0m0,179s
sys 0m3,948s
77:

real 0m0,509s
user 0m0,189s
sys 0m3,726s
78:

real 0m0,568s
user 0m0,391s
sys 0m3,945s
79:

real 0m0,519s
user 0m0,367s
sys 0m3,484s
80:

real 0m0,582s
user 0m0,350s
sys 0m4,134s
81:

real 0m0,592s
user 0m0,328s
sys 0m4,265s
82:

real 0m0,621s
user 0m0,259s
sys 0m4,530s
83:

real 0m0,615s
user 0m0,266s
sys 0m4,554s
84:

real 0m0,635s
user 0m0,353s
sys 0m4,617s
85:

real 0m0,625s
user 0m0,368s
sys 0m4,473s
86:

real 0m0,638s
user 0m0,372s
sys 0m4,636s
87:

real 0m0,611s
user 0m0,408s
sys 0m4,010s
88:

real 0m0,703s
user 0m0,277s
sys 0m5,129s
89:

real 0m0,664s
user 0m0,236s
sys 0m4,919s
90:

real 0m0,729s
user 0m0,241s
sys 0m5,404s
91:

real 0m0,727s
user 0m0,377s
sys 0m5,254s
92:

real 0m0,765s
user 0m0,365s
sys 0m5,638s
93:

real 0m0,756s
user 0m0,238s
sys 0m5,708s
94:

real 0m0,637s
user 0m0,291s
sys 0m4,643s
95:

real 0m0,755s
user 0m0,364s
sys 0m5,395s
96:

real 0m0,728s
user 0m0,256s
sys 0m5,399s
97:

real 0m0,750s
user 0m0,251s
sys 0m5,607s
98:

real 0m0,821s
user 0m0,425s
sys 0m5,826s
99:

real 0m0,808s
user 0m0,366s
sys 0m5,934s
100:

real 0m0,837s
user 0m0,421s
sys 0m6,094s
matteo@turbo:/tmp$