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B-7.2 GSS Performance Analysis

The GSS Extract processing load is described by the following equation, which is similar in structure to that described for Sync/Extract Telemetry in section B6.1:

Nominal LGE = ((G/10 words/sec) * (15 instr/word)) / (1.83 SPECint92/MIPS * 106)

where: LGE = GSS Extract load (SPECint92)

G = GSS status rate (bps)

words = GSS status words

The total GSS Conversion load is described by the following equation:

Nominal LGC = ((G/10 words/sec) * (48 instr/word)) / (1.83 SPECint92/MIPS) * 106

where: LGC = GSS Convert load (SPECint92)

G = GSS status rate (bps)

The GSS Monitor load is described by the following equation:

Nominal LGM = ((G*(0.05)/10 words/sec) / 3 words/rule) / (270 rules/sec/SPECint92)

where: LGM = GSS Monitor load (SPECint92)

G = GSS status rate (bps)

The GSS Display load is described by the following equation:

Nominal LGD = D * ((G*(0.01)/10 words/sec) / (250 meas/sec/SPECint92)

Table B-5 presents process loads for various GSS rates.

Table B-5. Summary GSS Process Loads


Nominal Load (SPECint92)

G

(bps)

LGE
LGC
LGM
LGD
1200
0.00098
0.00315
0.00741
0.00480
1912
0.00157
0.00502
0.01180
0.00765
2864
0.00235
0.00751
0.01768
0.01146
3112
0.00255
0.00816
0.01921
0.01245
6816
0.00559
0.01788
0.04207
0.02726

Figure B-12 illustrates the loading allocation for the highest data rate case (G = 6816 bps) listed in Table B-5. This case represents a worst-case GSS load, since the GSS Extract and Convert functions would not be accomplished on the 1200 bps local status data stream.

Figure B-12. GSS loading allocation (SPECint92).