peach vs each

Community Support
1

Hello,
I have 2 functions f1 and f2. Why is ‘peach’ slower than ‘each’ in f2?

q)\s

8i

q)f1:{do[100000;x+x]}

q)f2:{do[100000;x+2]}

q)\t f1 each til 8

218

q)\t f1 peach til 8

27

q)\t f2 each til 8

165

q)\t f2 peach til 8

307

(It seems having constants in the do loop makes ‘peach’ slower)

Thanks in advance.

2

Hi,

On mine it works as expected. Perhaps some of your cores were busy doing
other work. Try repeating it a few time while making sure nothing else
is running.

q)q)f1:{do[100000;x+x]}
q)q)f2:{do[100000;x+2]}
q)\t f1 each til 8
114
q)\t f1 peach til 8
45
q)\t f2 each til 8
148
q)\t f2 peach til 8
73
q)\s
8i
q).z.k
2012.11.13
q).z.K
3f

On 1/3/2013 12:37 PM, Jinming Shao wrote:
> Hello,
> I have 2 functions f1 and f2. Why is ‘peach’ slower than ‘each’ in f2?
>
> q)\s
> 8i
> q)f1:{do[100000;x+x]}
> q)f2:{do[100000;x+2]}
> q)\t f1 each til 8
> 218
> q)\t f1 peach til 8
> 27
> q)\t f2 each til 8
> 165
> q)\t f2 peach til 8
> 307
>
> (It seems having constants in the do loop makes ‘peach’ slower)
>
> Thanks in advance.
> –
> You received this message because you are subscribed to the Google
> Groups “Kdb+ Personal Developers” group.
> To post to this group, send email to personal-kdbplus@googlegroups.com.
> To unsubscribe from this group, send email to
> personal-kdbplus+unsubscribe@googlegroups.com.
> For more options, visit this group at
> http://groups.google.com/group/personal-kdbplus?hl=en.

3

I tried it several times, ‘peach’ is constantly slower than ‘each’ for f2.
Noticed my version is older than yours:

q).z.k

2012.05.29

q).z.K

3f