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Uemis downloader: add helper function to estimate memory needs

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[Dirk Hohndel: refactored one huge commit into smaller pieces]

Signed-off-by: Guido Lerch <guido.lerch@gmail.com>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
This commit is contained in:
Guido Lerch 2015-09-05 11:15:05 -07:00 committed by Dirk Hohndel
parent 4ba5dd85d4
commit ff0859ff21
1 changed files with 36 additions and 0 deletions
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36
uemis-downloader.c
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@ -34,6 +34,9 @@
//#define UEMIS_DEBUG 1 + 2
#define UEMIS_MAX_FILES 4000
#define UEMIS_MEM_FULL 3
#define UEMIS_MEM_CRITICAL 1
#define UEMIS_MEM_OK 0
#if UEMIS_DEBUG & 64 /* we are reading from a copy of the filesystem, not the device - no need to wait */
#define UEMIS_TIMEOUT 50 /* 50ns */
@ -900,6 +903,39 @@ static char *uemis_get_divenr(char *deviceidstr)
return strdup(divenr);
}
/* do some more sophisticated calculations here to try and predict if the next round of
* divelog/divedetail reads will fit into the UEMIS buffer,
* filenr holds now the uemis filenr after having read several logs including the dive details,
* fCapacity will five us the average number of files needed for all currently loaded data
* remember the maximum file usage per dive
* return : UEMIS_MEM_OK if there is enough memeory for a full round
* UEMIS_MEM_CRITICAL if the memory is good for reading the dive logs
* UEMIS_MEM_FULL if the memory is exhaused
*/
static int get_memory(struct dive_table *td)
{
if (td->nr == 0)
return UEMIS_MEM_OK;
if (filenr / td->nr > max_mem_used)
max_mem_used = filenr / td->nr;
/* predict based on the max_mem_used value if the set of next 11 divelogs plus details
* fit into the memory before we have to disconnect the UEMIS and continuem. To be on
* the safe side we calculate using 12 dives. */
if (max_mem_used * 11 > UEMIS_MAX_FILES - filenr) {
/* the next set of divelogs will most likely not fit into the memory */
if (nr_divespots * 2 > UEMIS_MAX_FILES - filenr) {
/* if we get here we have a severe issue as the divespots will not fit into
* this run either. */
return UEMIS_MEM_FULL;
}
/* we continue reading the divespots */
return UEMIS_MEM_CRITICAL;
}
return UEMIS_MEM_OK;
}
const char *do_uemis_import(device_data_t *data)
{
const char *mountpath = data->devname;