µC/FS Benefits
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Benefits
Performance
A benchmark is used to measure the speed of the software on available targets. This benchmark is in no way complete, but it gives an approximation of the length of time required for common operations on various targets.
Configuration and performance table
All values are in KBytes/sec.
| ARM 7 (50 MHz) |
Hard drive |
2431 |
2434 |
4167 |
| ARM 7 (50 MHz) |
Compact Flash, IDE mode |
1882 |
1882 |
2000 |
| ARM 7 (50 MHz) |
Compact Flash, memory-mapped |
2782 |
2782 |
2560 |
| ARM 7 (50 MHz) |
MMC / SD using SPI with 12MHz |
1280 |
1333 |
1488 |
| XScale (208 MHz) |
MMC / SD using SD4 card mode with 20MHz |
7262 |
7262 |
5389 |
| ARM 7 (50 MHz) |
SMC |
392 |
390 |
771 |
| ARM 7 (50 MHz) |
NAND Flash 8MB |
474 |
474 |
771 |
| ARM 7 (50 MHz) |
NOR flash |
172 |
91 |
1254 |
| ARM 7 (50 MHz) |
RAM disk |
4000 |
4000 |
4571 |
Description of the performance tests
| Performance test |
Description |
| W0: Writing |
- Open a file for writing .
- Write data to the opened file in chunks of 64 kBytes, using 80% of the volume capacity but no more than 4 MByte. Writing a 64KByte chunk is measured.
- Close the file
|
| W1: Writing |
- Reopen the file for writing (old created file will be deleted).
- Write data to the opened file in chunks of 64kBytes, using 80% of the capacity of the medium but no more than 4MByte. Writing a 64KByte chunk is measured.
- Close the file.
|
| R: Reading |
- Open the file for reading
- Read 4 MBytes from file in 64KByte chunks. Reading a 64KByte chunk is measured. (R1)
- Close the file.
|
Memory footprint
The file system is designed to fit many kinds of embedded design requirements. Several features can be excluded from build to get a minimal system that can efficiently access any media.
In the following section memory usage for different typical 16 and 32- bit systems is listed.
Please note that the values given are approximate values. Features can affect the size of other featuress. For example if FAT32 is deactivated, the format function gets smaller because the 32 bit specific part of format is not added into the compilation.
This minimal configuration supports FAT12/16, but has no media format features, no directory support, no free disk space function (DiskInfo) and only one file can be opened at a time:
The configuration file (FS_Conf.h) looks as follows:
| #define FS_POSIX_DIR_SUPPORT |
0 |
| #define FS_FAT_NOFORMAT |
1 |
| #define FS_FAT_DISKINFO |
0 |
| #define FS_FAT_NOFAT32 |
1 |
| #define FS_MAXOPEN |
1 |
16-bit CPUs
System
| CPU |
M16C |
| Tool chain |
IAR Workbench for M16C V2.12A |
| Memory Model |
Data model: Near pointer; Constants: near memory |
| Compiler options |
Highest size optimization |
| Device driver |
MMC/SD driver |
Memory requirements
| Minimal file system |
11384 |
1122 |
| MMC/SD driver |
+2172 |
528 |
| Additional support for |
| Directory |
+2654 |
+1310 (for each directory) |
| (Auto) format |
+2175 |
0 |
| Diskinfo |
+758 |
0 |
| FAT32 |
+658 |
0 |
| |
| Additional open files |
0 |
1060 |
32-bit CPUs
System
| Detail |
Description |
| CPU |
ARM 7 |
| Tool chain |
IAR Workbench for ARM V4.11A |
| Memory Model |
ARM7, thumb instructions; no interwork; |
| Compiler options |
Highest size optimization; |
| Device driver |
MMC/SD driver |
Memory requirements
| Detail |
ROM [Bytes] |
RAM [Bytes] |
| Minimal file system |
10298 |
1129 |
| MMC/SD driver |
+2358 |
532 |
| Additional support for |
| Directory |
+2208 |
+1328 (for each directory) |
| (Auto) format |
+2056 |
0 |
| Diskinfo |
488 |
0 |
| FAT32 |
352 |
0 |
| |
| Additional open files |
0 |
1068 |
|
