Path: utzoo!mnetor!uunet!mcvax!enea!kuling!irf From: irf@kuling.UUCP (Bo Thide) Newsgroups: comp.sys.hp Subject: Re: HP825 math 15x SLOWER than 825 Message-ID: <696@kuling.UUCP> Date: 19 Apr 88 19:12:20 GMT References: <830004@bgphp1.UUCP> <8870004@hpsel1.HP.COM> Reply-To: irf@kuling.UUCP (Bo Thide) Organization: Dept. of Computer Systems, Uppsala University, Sweden Lines: 93 In article <8870004@hpsel1.HP.COM> campbelr@hpsel1.HP.COM (Bob Campbell) writes: >> . . . . . . . . . . . . . . . I am concerned (and so are my users) >> that any replacement machine be as solid as the 500 (e.g. as of this >> writing we have been up 136 days and have never had a crash). >> >> Can anyone tell me their experience with the HP9000 series 825 or >> 300 (or for that matter other machines in this price/speed class)? >> Are there other machines that are as solid as the 500? >> > >I believe that in the area of powerfail recovery, the 800 series may >be the most reliable system yet. Of course I am biased and the 300 series >folks might have a thing to say :-) Hopefully the responses to the problem I have had my 350 for 5 months by now and, wow, am I pleased with it. Not a single problem so far. The machine booted up in late November and the HP-UX hasn't crashed once. (I also have the Pascal Workstation and HP BASIC operating systems installed on the same disc as HP-UX and Pascal has crashed twice, probably since I have been playing around with special ADC and FFT hardware which I'm trying to connect to the DIO bus). Already from the start I found the 350 to be a VERY FAST machine and after installing the HP FPA it really flies. Below are some simple 350 benchmarks and comparisons with the 540. -Bo ------------------------------------------------------------------------------ Benchmark results for HP9000/350 (8 MByte DRAM) running HP-UX 5.5. Below are printouts from standard FORTRAN77 programs with straight ANSI code (compiled with 'f77 -O') according to "HP 9000 Computers Series 200 and 500 Performance Guide" (HP 5953-9405 11/83). The program contains 5 consecutive DO-loops. The first loop, used for estimating loop overhead, only assigns a constant to a dummy variable. The other loops do the same assigments plus additions, subtractions, multiplications, and divisions, respectively. All loops are run 1 000 000 times and are timed individually by using the internal clock and are corrected for the loop overhead. The programs were run in a 16 user HP-UX Unix environment but with real-time priority ('rtprio') = 0. No assembler code or any other tricks were used. --------------------------------------------------------------------bt-880216- Without floating point accelerator: Loop overhead is .48 seconds Time for 1000000 REAL*4 adds is 3.95 seconds Time for 1000000 REAL*4 subtracts is 3.95 seconds Time for 1000000 REAL*4 multiplys is 4.35 seconds Time for 1000000 REAL*4 divides is 4.72 seconds Loop overhead is .50 seconds Time for 1000000 REAL*8 adds is 3.92 seconds Time for 1000000 REAL*8 subtracts is 3.93 seconds Time for 1000000 REAL*8 multiplys is 4.70 seconds Time for 1000000 REAL*8 divides is 6.25 seconds With floating point accelerator: Loop overhead is .47 seconds Time for 1000000 REAL*4 adds is .82 seconds Time for 1000000 REAL*4 subtracts is .80 seconds Time for 1000000 REAL*4 multiplys is .82 seconds Time for 1000000 REAL*4 divides is 1.97 seconds Loop overhead is .47 seconds Time for 1000000 REAL*8 adds is .83 seconds Time for 1000000 REAL*8 subtracts is .82 seconds Time for 1000000 REAL*8 multiplys is .87 seconds Time for 1000000 REAL*8 divides is 3.33 seconds ------------------------------------------------------------------------ For comparison, here is the same test run on an HP9000/540 with a FOCUS II CPU (including FPA): Loop overhead is 4.52 seconds Time for 1000000 REAL*4 adds is 3.15 seconds Time for 1000000 REAL*4 subtracts is 2.70 seconds Time for 1000000 REAL*4 multiplys is 3.30 seconds Time for 1000000 REAL*4 divides is 4.50 seconds Loop overhead is 4.52 seconds Time for 1000000 REAL*8 adds is 3.90 seconds Time for 1000000 REAL*8 subtracts is 3.60 seconds Time for 1000000 REAL*8 multiplys is 4.18 seconds Time for 1000000 REAL*8 divides is 5.23 seconds ------------------------------------------------------------------------ -- >>> Bo Thide', Swedish Institute of Space Physics, S-755 90 Uppsala, Sweden <<< Phone (+46) 18-300020. Telex: 76036 (IRFUPP S). UUCP: ..enea!kuling!irfu!bt