Prestoserve and NFS performance
Chet Juszczak
chet at decvax.dec.com
Tue Feb 12 10:58:09 AEST 1991
Following my earlier posting on how Prestoserve affects NFS server
performance, I received a number of questions about how the
DECsystem 5100 and DECsystem 5500 platforms perform when Prestoserve
is not being used; i.e. exactly what performance difference is the
NVRAM acceleration making over what the platforms are capable of
without it.
This posting contains three plots in postscript form.
These plots show NFS server performance measurements
made on DECsystem 5100 and DECsystem 5500 servers with RZ57
scsi disks with and without Prestoserve. The measurements were made
by me.
The methodology used was the same as described in my earlier
posting: the nhfsstone benchmark program was run on a DECsystem 5500
client. The machines were on a private network. Configuration information
is included on the plots.
The first plot shows measurements made with a DECsystem 5100 server,
the second plot shows measurements made with a DECsystem 5500 server,
and the third plot combines the data from the first two.
Note that adding a second disk to the disk based configurations
made a significant impact, while it made little difference
to the NVRAM based configurations. Other testing has shown little
effect upon server response for this benchmark when using slower disks.
Assuming reasonable server cache hit rates for read requests,
varying the number of disks and disk speed has little impact upon
the NVRAM based server response profile.
-chet
Chet Juszczak chet at decvax.dec.com
Digital Equipment Corporation decvax!chet
110 Spit Brook Rd. ZKO3-3/U14
Nashua, NH 03062
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%%%%%%%%%%%%%%%%%%%%%%% CURVE SMOOTHING %%%%%%%%%%%%%%%%%%%%%%
% Curve Smoothing Routines
% Ernest Wood - Wed Apr 16 09:05:05 1986
%
% These routines will ALWAYS create a smooth curve which
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%
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%%%%%%%%%%%%%%%%%%%%%%% CURVE SMOOTHING %%%%%%%%%%%%%%%%%%%%%%
% Curve Smoothing Routines
% Ernest Wood - Wed Apr 16 09:05:05 1986
%
% These routines will ALWAYS create a smooth curve which
% intercepts EVERY point used to generate them.
%
% The definition qA determines the amount of overshoot smoothing
% produces around each point. The distance is the distance to the
% next point times aA. The factor qB scales the amount of overshoot
% by the acuteness of the angle around the point.
%
% These values make a square of points into a circle.
/qA .3 def % used in qx
/qB 1 def % used in afactor
/8a 8 array def
%
% Angle of vector from p0 to p1 p0 p1 polar ang
/polar{qs neg exch neg atan}def
%subtract and add points p0 p1 qs p0-p1
% p0 p1 qa p0+p1
/qs{exch 3 1 roll sub 3 1 roll sub exch}def
/qa{exch 3 1 roll add 3 1 roll add exch}def
% Extract point from 8 point array
%
/Pt{2 mul dup 8a exch get exch 1 add 8a exch get}def
% a0 a1 mirrorang ma
% If a0 is the angle from p1 to p0 and a1 is the angle from
% p1 to p2 then ma is the mirror angle between p0-p1 and p1-p2.
% a0 a1 afactor f
% If a0 is the angle from p1 to p0 and a1 is the angle from
% p1 to p2 then f is the ratio of the inside angle between a0 and a1
% and 180 times qB. This ratio is saturated at 1 and if qB is 0 then
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%
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% Given angle a and distance d
% produce x and y offsets.
%
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% p0 p1 p2 p3 qx pp1 pp2 pp3
% Given 4 points on a curve produce the pp# values needed by
% curveto to draw a smooth curve between p1 and p2. The slope
% of the curve at p1 and p2 will be perpendicular to the bisector
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%
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%
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% size fontname SetTxt -> set font 'fontname' scaled by 'size'
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%9 added to distinguish from other clashing scribe definitions
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%%%%%%%%%%%%%%%%%%%%%%% CURVE SMOOTHING %%%%%%%%%%%%%%%%%%%%%%
% Curve Smoothing Routines
% Ernest Wood - Wed Apr 16 09:05:05 1986
%
% These routines will ALWAYS create a smooth curve which
% intercepts EVERY point used to generate them.
%
% The definition qA determines the amount of overshoot smoothing
% produces around each point. The distance is the distance to the
% next point times aA. The factor qB scales the amount of overshoot
% by the acuteness of the angle around the point.
%
% These values make a square of points into a circle.
/qA .3 def % used in qx
/qB 1 def % used in afactor
/8a 8 array def
%
% Angle of vector from p0 to p1 p0 p1 polar ang
/polar{qs neg exch neg atan}def
%subtract and add points p0 p1 qs p0-p1
% p0 p1 qa p0+p1
/qs{exch 3 1 roll sub 3 1 roll sub exch}def
/qa{exch 3 1 roll add 3 1 roll add exch}def
% Extract point from 8 point array
%
/Pt{2 mul dup 8a exch get exch 1 add 8a exch get}def
% a0 a1 mirrorang ma
% If a0 is the angle from p1 to p0 and a1 is the angle from
% p1 to p2 then ma is the mirror angle between p0-p1 and p1-p2.
% a0 a1 afactor f
% If a0 is the angle from p1 to p0 and a1 is the angle from
% p1 to p2 then f is the ratio of the inside angle between a0 and a1
% and 180 times qB. This ratio is saturated at 1 and if qB is 0 then
% the value returned is always 1. Thus the more acute the angle
% the smaller the value of f.
%
/mirrorang{2 copy add 2 div 3 1 roll sub 0 lt {90} {-90}ifelse add}def
/afactor{
qB 0 eq
{ 1 }
{sub abs dup 180 gt {360 exch sub} if 180 div qB mul
dup 1 gt {pop 1} if}
ifelse
}def
% a d xya x y
% Given angle a and distance d
% produce x and y offsets.
%
/xya{exch 2 copy cos mul 3 1 roll sin mul}def
% p0 p1 p2 p3 qx pp1 pp2 pp3
% Given 4 points on a curve produce the pp# values needed by
% curveto to draw a smooth curve between p1 and p2. The slope
% of the curve at p1 and p2 will be perpendicular to the bisector
% of a angle between p0/p1/p2 or p1/p2/p3.
%
/qx{
8a astore pop
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1 Pt 0 Pt polar
1 Pt 2 Pt polar
2 copy mirrorang
3 1 roll afactor dist mul
xya 1 Pt qa
2 Pt 3 Pt polar
2 Pt 1 Pt polar
2 copy mirrorang
3 1 roll afactor dist mul
xya 2 Pt qa
2 Pt
}def
/qp{8 copy 16 -2 roll pop pop}def
/ns1{4 copy 4 -2 roll 2 copy qa 4 2 roll qs 6 2 roll /ns{ns2}def }def
/ns2{qp qx curveto}def
% User definitions for curve smoothing routines.
% First (ms), intermediate (ns), and last points with (fs) and
% without (nsfs) automatic stroke execution.
%
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/ns{ns1}def
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D9
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321.485 394.056 ns
nsend
D9
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D9
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