Pipe is slow

[atom]

Sometimes, with a lot of GPU power, it takes a bit of manual support. Please optimize your attack. Here's an example:

root@et:~/hashcat-0.50# head -10000 /root/dict/untouched/rockyou.txt > rockyou10k.txt
root@et:~/hashcat-0.50# /root/maskprocessor/mp64.bin '$?d $?d $?d $?d' > hybrid.rule
root@et:~/hashcat-0.50# wc -l rockyou10k.txt
10000 rockyou10k.txt
root@et:~/hashcat-0.50# wc -l hybrid.rule
10000 hybrid.rule
root@et:~/hashcat-0.50# time ./hashcat-cli64.bin --stdout rockyou10k.txt -r hybrid.rule | wc -l
100000000

real 1m39.119s
user 0m18.515s
sys 2m45.179s

That's compareable to what you did. It's just 1 M/s on my 4770k. A better approach would be this:

root@et:~/hashcat-utils-1.2# head -10000 /root/dict/untouched/rockyou.txt > rockyou10k.txt
root@et:~/hashcat-utils-1.2# /root/maskprocessor/mp64.bin ?d?d?d?d > right.txt
root@et:~/hashcat-utils-1.2# wc -l rockyou10k.txt
10000 rockyou10k.txt
root@et:~/hashcat-utils-1.2# wc -l right.txt
10000 right.txt
root@et:~/hashcat-utils-1.2# time ./combinator.bin rockyou10k.txt right.txt | wc -l
100000000

real 0m1.906s
user 0m1.785s
sys 0m0.382s

That's 52 M/s which should be sufficient to feed your GPUs.