Test script for parameter detemination.

see https://github.com/pellepl/spiffs/issues/169

py/sp_test.py

@@ -0,0 +1,70 @@
+#!/usr/bin/python
+
+"Test spiffs filesystem with a range of parameters"
+
+import spiffs
+
+class SpiffsInstr(spiffs.SpiffsCharsBack):
+    "Keeps count of issued reads / writes / erases"
+    def __init__(self, *args, **kwargs):
+        self.reset_counters()
+        supe = super(SpiffsInstr, self)
+
+        self.super_read = supe.on_read
+        self.super_write = supe.on_write
+        self.super_erase = supe.on_erase
+
+        supe.__init__(*args, **kwargs)
+
+    def reset_counters(self):
+        self.read_requests = []
+        self.write_requests = []
+        self.erase_requests = []
+
+    def on_read(self, addr, size):
+        self.read_requests.append([addr, size])
+        return self.super_read(addr, size)
+    def on_write(self, addr, data):
+        self.write_requests.append([addr, len(data)])
+        return self.super_write(addr, data)
+    def on_erase(self, addr, size):
+        self.erase_requests.append([addr, size])
+        return self.super_erase(addr, size)
+
+# Physical parameters
+flash_size = 8*1024*1024
+erase_size = 256
+
+print "filesystem size =",flash_size
+
+header = "log_block_size","log_page_size","reads","read_bytes","writes","written_bytes"
+print '| %s |'%(' | '.join(header))
+header2 = ['-'*len(x) for x in header]
+print '| %s |'%(' | '.join(header2))
+
+for log2_log_block_size in range(14,19):
+    log_block_size = 1<<log2_log_block_size
+    for log2_log_page_size in range(8,11):
+        log_page_size = 1<<log2_log_page_size
+
+        backing = ['\xff']*flash_size
+
+        s = SpiffsInstr(backing,
+                        0,
+                        erase_size,
+                        log_page_size,
+                        log_block_size)
+
+        s.dir()
+
+        #for i in range(100):
+        #    with s.open("Test File %d.txt"%i,"w") as fd:
+        #        fd.write('.'*1024*10)
+
+        s.unmount()
+
+        result = (log_block_size,log_page_size,
+                  len(s.read_requests), sum(size for block,size in s.read_requests),
+                  len(s.write_requests), sum(size for block,size in s.write_requests))
+
+        print '| %s |'%(' | '.join(map(str,result)))