Revision 849
Added by Borja Sotomayor over 13 years ago
| vm_scheduler.py | ||
|---|---|---|
| 1281 | 1281 |
if threshold != None: |
| 1282 | 1282 |
# If there is a hard-coded threshold, use that |
| 1283 | 1283 |
return threshold |
| 1284 |
else: |
|
| 1284 |
|
|
| 1285 |
if config.get("suspension") != constants.SUSPENSION_NONE:
|
|
| 1285 | 1286 |
factor = config.get("scheduling-threshold-factor")
|
| 1286 | 1287 |
|
| 1287 | 1288 |
# First, figure out the "safe duration" (the minimum duration |
| ... | ... | |
| 1293 | 1294 |
if lease.get_state() == Lease.STATE_SUSPENDED_QUEUED: |
| 1294 | 1295 |
resm_overhead = lease.estimate_resume_time() |
| 1295 | 1296 |
safe_duration += resm_overhead |
| 1297 |
else: |
|
| 1298 |
safe_duration = 0 |
|
| 1296 | 1299 |
|
| 1297 |
# TODO: Incorporate other overheads into the minimum duration
|
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| 1298 |
min_duration = safe_duration
|
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| 1299 |
|
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| 1300 |
# At the very least, we want to allocate enough time for the
|
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| 1301 |
# safe duration (otherwise, we'll end up with incorrect schedules,
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| 1302 |
# where a lease is scheduled to suspend, but isn't even allocated
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| 1303 |
# enough time to suspend).
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| 1304 |
# The factor is assumed to be non-negative. i.e., a factor of 0
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| 1305 |
# means we only allocate enough time for potential suspend/resume
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| 1306 |
# operations, while a factor of 1 means the lease will get as much
|
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| 1307 |
# running time as spend on the runtime overheads involved in setting
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| 1308 |
# it up
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| 1309 |
threshold = safe_duration + (min_duration * factor)
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| 1310 |
return threshold
|
|
| 1300 |
# TODO: Incorporate other overheads into the minimum duration |
|
| 1301 |
min_duration = safe_duration |
|
| 1302 |
|
|
| 1303 |
# At the very least, we want to allocate enough time for the |
|
| 1304 |
# safe duration (otherwise, we'll end up with incorrect schedules, |
|
| 1305 |
# where a lease is scheduled to suspend, but isn't even allocated |
|
| 1306 |
# enough time to suspend). |
|
| 1307 |
# The factor is assumed to be non-negative. i.e., a factor of 0 |
|
| 1308 |
# means we only allocate enough time for potential suspend/resume |
|
| 1309 |
# operations, while a factor of 1 means the lease will get as much |
|
| 1310 |
# running time as spend on the runtime overheads involved in setting |
|
| 1311 |
# it up |
|
| 1312 |
threshold = safe_duration + (min_duration * factor) |
|
| 1313 |
return threshold |
|
| 1311 | 1314 |
|
| 1312 | 1315 |
|
| 1313 | 1316 |
#-------------------------------------------------------------------# |
Also available in: Unified diff
If we're not using suspension, set the scheduling threshold to 0.