Performance Test of the nioii Processor

Source: Internet
Author: User
Tags usleep

In this paper, the performance of the niosii processor's economical type niosii/E and fast type niosii/F are tested in different optimization methods.Code.
1. printf // print the file

2. usleep (1000) // sleep time

3. iowr_altera_avalon_pio_data // port read/write

The test code is as follows:

# Include <stdio. h>
# Include "system. H"
# Include "unistd. H"
# Include "altera_avalon_performance_counter.h"
# Include "altera_avalon_pio_regs.h"

Int main ()
{
Perf_reset (performance_counter_base );
Perf_start_measuring (performance_counter_base );
Perf_begin (performance_counter_base, 1 );
Printf ("hello from NiO II! \ N "); // test printf
Perf_end (performance_counter_base, 1 );
Perf_begin (performance_counter_base, 2 );
Usleep (1000); // test usleep
Perf_end (performance_counter_base, 2 );
Perf_begin (performance_counter_base, 3 );
// Iowr_altera_avalon_pio_data (pio_base, 0x00); // test IOWR
IOWR (pio_base, 0, 0x00 );
Perf_end (performance_counter_base, 3 );
Perf_stop_measuring (performance_counter_base );
Perf_print_formatted_report (performance_counter_base, alt_get_cpu_freq (),
3, "printf", "usleep", "IOWR ");
Return 0;
}

The test results are as follows:

Table 1: niosii/e, not optimized

Section

%

Time (SEC)

Time (clocks)

Occurrences

Printf

20.9

0.00113

56317

1

Usleep

79

0.00427

213400

1

IOWR

0.0459

0.00000

124

1

Table 2: NiO II/e, optimization: optimize-03

Section

%

Time (SEC)

Time (clocks)

Occurrences

Printf

13.9

0.00065

32648

1

Usleep

86

0.00404

201865

1

IOWR

0.0383

0.00000

90

1

Table 3: NiO II/e, optimization: optimize-0 s

Section

%

Time (SEC)

Time (clocks)

Occurrences

Printf

13.4

0.00063

31439

1

Usleep

86.5

0.00405

202681

1

IOWR

0.0358

0.00000

84

1

Table 4: niosii/F, not optimized

Section

%

Time (SEC)

Time (clocks)

Occurrences

Printf

18.7

0.00023

11387

1

Usleep

81.1

0.00099

49290

1

IOWR

0.0428

0.00000

26

1

Table 5: NiO II/F, optimization: optimize-03

Section

%

Time (SEC)

Time (clocks)

Occurrences

Printf

11

0.00012

5969

1

Usleep

88.9

0.00097

48281

1

IOWR

0.0147

0.00000

8

1

Table 6: NiO II/F, optimization: optimize-0 s

Section

%

Time (SEC)

Time (clocks)

Occurrences

Printf

12.1

0.00013

6653

1

Usleep

87.8

0.00097

48315

1

IOWR

0.0473

0.00000

26

1

By comparing the data in the above six tables, the performance of nioⅱ/E and nioⅱ/F is still quite different. From the data in the table, the performance difference is more than 4 times, after the same processor optimization, the performance is improved by about 25% compared with before optimization. For-03 optimization and-0 s optimization, the performance is basically the same. In addition, usleep (1000), that is, the latency of 1 ms is set only when it is run in nioⅱ/F. The actual latency in nioⅱ/E isProgramAbout 4 times of the specified time (1 ms), that is, 4 ms.

according to the information provided by Altera:
In niosii performance benchmarks (alteras document) are this dmips ratio: niosii/F-1.105, niosii/S-0.518,
If the 50 MHz clock is used, the dmips of the cup is
niosii/F: 1.105*50 = 55.25 dmips
niosii/S: 0.518*50 = 25.9 dmips
niosii/E: 0.107*50 = 5.35 dmips
the condition for this performance is to run in onchip-MEM, and optimize is-03. Cycloneii device. The program in this article runs in external SDRAM

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