Xref: utzoo comp.sys.dec:5026 comp.protocols.nfs:1773 comp.unix.ultrix:6164
Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!swrinde!elroy.jpl.nasa.gov!decwrl!deccrl!news.crl.dec.com!decvax.dec.com!decvax!chet
From: chet@decvax.dec.com (Chet Juszczak)
Newsgroups: comp.sys.dec,comp.protocols.nfs,comp.unix.ultrix
Subject: Re: Prestoserve and NFS performance
Keywords: Prestoserve, NFS performance
Message-ID: <547@decvax.decvax.dec.com.UUCP>
Date: 11 Feb 91 23:58:09 GMT
References: <542@decvax.dec.com.UUCP>
Sender: news@decvax.dec.com.UUCP
Reply-To: chet@decvax.dec.com (Chet Juszczak)
Followup-To: comp.sys.dec
Organization: ULTRIX Engineering
Lines: 1663


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@decvax.dec.com
Digital Equipment Corporation		decvax!chet
110 Spit Brook Rd. ZKO3-3/U14
Nashua, NH 03062

***************** start of postcript plots - cut here ***********************
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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
%
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/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

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%
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/ns{ns1}def
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385.498 242.424 ns
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446.726 321.336 ns
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151.027 182.304 ns
189.216 192.672 ns
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265.094 233.856 ns
302.4 258.84 ns
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365.856 341.064 ns
368.544 343.584 ns
370.848 342.792 ns
nsend
D9
111.974 125.424 ms
150.509 132.624 ns
190.003 142.128 ns
227.098 146.808 ns
266.765 162.432 ns
305.318 175.68 ns
348.134 199.44 ns
384.826 210.528 ns
418.368 238.176 ns
441.293 282.024 ns
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% E9 is fills for incremental curves, while F9 for curve segments

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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
    1 Pt 2 Pt qs len qA mul /dist exch def
    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.
%
/ms{2 copy newpath moveto /ns{ns1}def}def
/ns{ns1}def
/fs{stroke}def
/nsfs{ns 4 copy 2 copy qa 4 2 roll qs qx curveto}def
/nsend{4 copy 2 copy qa 4 2 roll qs qx curveto}def

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387.725 152.136 ns
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189.216 164.448 ns
227.386 176.184 ns
266.227 183.6 ns
303.283 191.304 ns
348.192 207.216 ns
380.256 233.856 ns
418.368 250.776 ns
447.168 262.296 ns
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471.302 273.384 ns
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190.061 117.648 ns
227.578 122.688 ns
266.669 129.816 ns
305.03 133.56 ns
350.784 143.496 ns
385.267 148.896 ns
424.397 156.24 ns
457.152 164.736 ns
499.181 178.344 ns
533.587 193.392 ns
571.949 221.976 ns
576.979 230.76 ns
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/Procs 15 dict def
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/Cross {
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/Triangle {
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 newpath -500 -500 moveto 500 500 lineto stroke
 newpath -500 500 moveto 500 -500 lineto stroke } def

end

/BuildChar {
 1000 0 -500 -500 500 500 setcachedevice
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end

/Symbols symbolFont definefont pop

% size SetSym		-> set font to be symbols scaled by 'size'
/SetSym { /Symbols findfont exch scalefont setfont } def

% size fontname SetTxt		-> set font 'fontname' scaled by 'size'
/SetTxt { findfont exch scalefont setfont } def

% dashtype thicknes SL
/SL { setlinewidth 0 setdash } def

/cross {2 copy le {exch pop} {pop} ifelse} def

%9 added to distinguish from other clashing scribe definitions
% from to L9	-> print line between points 'from' and 'to'
/L9 { newpath moveto lineto stroke } def
/S9 { newpath moveto } def
/M9 { lineto } def
/D9 { stroke } def
/SS9 { setscreen } def
/G9 { setgray } def
/F9 {newpath moveto lineto lineto lineto closepath fill} def
/E9 {closepath fill} def
% E9 is fills for incremental curves, while F9 for curve segments

/Landscape {612 0 translate 90 rotate} def

% save current point in global variable psx psy
/SAVPOS { /psx currentpoint pop def /psy currentpoint exch pop def } def

% string angle xpos ypos TXL	-> print 'string' at pos xpos, ypos
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/SY { moveto show } def

/len {dup mul exch dup mul add sqrt}def


%%%%%%%%%%%%%%%%%%%%%%%  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
    1 Pt 2 Pt qs len qA mul /dist exch def
    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.
%
/ms{2 copy newpath moveto /ns{ns1}def}def
/ns{ns1}def
/fs{stroke}def
/nsfs{ns 4 copy 2 copy qa 4 2 roll qs qx curveto}def
/nsend{4 copy 2 copy qa 4 2 roll qs qx curveto}def

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265.094 233.856 ns
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365.856 341.064 ns
368.544 343.584 ns
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190.003 142.128 ns
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266.765 162.432 ns
305.318 175.68 ns
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384.826 210.528 ns
418.368 238.176 ns
441.293 282.024 ns
446.016 287.136 ns
449.069 285.12 ns
nsend
D9
111.533 153.72 ms
150.778 170.352 ns
189.062 185.904 ns
227.654 207.144 ns
266.035 227.448 ns
301.44 282.096 ns
325.056 346.68 ns
322.118 388.584 ns
321.485 394.056 ns
nsend
D9
111.322 112.392 ms
151.027 115.632 ns
189.542 116.064 ns
227.558 126.216 ns
267.629 129.816 ns
305.146 135.36 ns
350.688 142.704 ns
387.725 152.136 ns
420.845 168.696 ns
456.864 178.272 ns
500.755 189.72 ns
534.067 203.472 ns
560.794 233.784 ns
573.581 230.04 ns
566.899 235.152 ns
nsend
D9
111.302 156.672 ms
150.816 158.112 ns
189.216 164.448 ns
227.386 176.184 ns
266.227 183.6 ns
303.283 191.304 ns
348.192 207.216 ns
380.256 233.856 ns
418.368 250.776 ns
447.168 262.296 ns
464.448 271.584 ns
471.302 273.384 ns
nsend
D9
111.725 109.152 ms
150.912 110.736 ns
190.061 117.648 ns
227.578 122.688 ns
266.669 129.816 ns
305.03 133.56 ns
350.784 143.496 ns
385.267 148.896 ns
424.397 156.24 ns
457.152 164.736 ns
499.181 178.344 ns
533.587 193.392 ns
571.949 221.976 ns
576.979 230.76 ns
589.555 228.024 ns
nsend
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