[libvirt] [libvirt-test-api][PATCH 1/3] introduce 2 functions in utils

[hongming]

  ACK and Pushed

Thanks
Hongming
On 04/24/2015 12:53 PM, Jianwei Hu wrote:
> It's OK to me, please hongming help review it again.
>
> BR,
> Jianwei
> ----- Original Message -----
> From: "Luyao Huang" <lhuang at redhat.com>
> To: libvir-list at redhat.com
> Cc: "Luyao Huang" <lhuang at redhat.com>
> Sent: Wednesday, April 22, 2015 9:00:55 PM
> Subject: [libvirt] [libvirt-test-api][PATCH 1/3] introduce 2 functions in	utils
>
> get_standard_deviation() is to get Standard Deviation, and
> param_to_tuple_nolength() allow do not pass lengh when use
> param_to_tuple().
>
> Signed-off-by: Luyao Huang <lhuang at redhat.com>
> ---
>   utils/utils.py | 28 ++++++++++++++++++++++++++++
>   1 file changed, 28 insertions(+)
>
> diff --git a/utils/utils.py b/utils/utils.py
> index c3e46f6..954b2bf 100644
> --- a/utils/utils.py
> +++ b/utils/utils.py
> @@ -31,6 +31,7 @@ import string
>   import subprocess
>   import hashlib
>   import libvirt
> +import math
>   from xml.dom import minidom
>   from urlparse import urlparse
>   
> @@ -896,3 +897,30 @@ def validate_remote_blk_type(hostname, username, password,
>       else:
>           logger.info("lspci and lsmod return nothing")
>           return 1
> +
> +def get_standard_deviation(cb1, cb2, opaque1, opaque2, number = 1000):
> +    """ pass two callback functions and opaque return Standard Deviation,
> +        this function will be useful when need equal some quick change
> +        value (like memory, cputime), default loop times are 1000,
> +        and notice callback functions cb1 and cb2 should allways success
> +    """
> +    D = 0
> +    for i in range(number):
> +        a = cb1(opaque1)
> +        b = cb2(opaque2)
> +        D += (int(a) - int(b))**2
> +    return math.sqrt(D/number)
> +
> +def param_to_tuple_nolength(paramlist):
> +    """paramlist contains numbers which can be divided by '-', '^' and
> +       ',', return tuple only have True or False value
> +    """
> +    d = []
> +    a = paramlist.split(',')
> +    for i in range(len(a)):
> +        if a[i].find('^') >= 0:
> +            continue
> +        d += a[i].split('-')
> +    lengh = max(d)
> +
> +    return param_to_tuple(paramlist, int(lengh) + 1)