From: francois Date: Sun, 15 Aug 2010 14:19:33 +0000 (-0700) Subject: web: refactor rate computation, fixes #1166 X-Git-Tag: allmydata-tahoe-1.8.0c3~10 X-Git-Url: https://git.rkrishnan.org/specifications/components/com_hotproperty/rgr-080307.php?a=commitdiff_plain;h=f026927f86584870288ae255ec0903a670241420;p=tahoe-lafs%2Ftahoe-lafs.git web: refactor rate computation, fixes #1166 --- diff --git a/src/allmydata/test/test_web.py b/src/allmydata/test/test_web.py index 78b99028..30080464 100644 --- a/src/allmydata/test/test_web.py +++ b/src/allmydata/test/test_web.py @@ -87,6 +87,10 @@ def build_one_ds(): ds.add_segment_request(2, now+4) ds.add_segment_request(3, now+5) + # simulate a segment which gets delivered faster than a system clock tick (ticket #1166) + ds.add_segment_request(4, now) + ds.add_segment_delivery(4, now, 0, 140, 0.5) + e = ds.add_dyhb_sent("serverid_a", now) e.finished([1,2], now+1) e = ds.add_dyhb_sent("serverid_b", now+2) # left unfinished @@ -3169,6 +3173,22 @@ class Util(ShouldFailMixin, testutil.ReallyEqualMixin, unittest.TestCase): self.failUnlessReallyEqual(common.abbreviate_time(0.000123), "123us") self.failUnlessReallyEqual(common.abbreviate_time(-123000), "-123000000000us") + def test_compute_rate(self): + self.failUnlessReallyEqual(common.compute_rate(None, None), None) + self.failUnlessReallyEqual(common.compute_rate(None, 1), None) + self.failUnlessReallyEqual(common.compute_rate(250000, None), None) + self.failUnlessReallyEqual(common.compute_rate(250000, 0), None) + self.failUnlessReallyEqual(common.compute_rate(250000, 10), 25000.0) + self.failUnlessReallyEqual(common.compute_rate(0, 10), 0.0) + self.shouldFail(AssertionError, "test_compute_rate", "", + common.compute_rate, -100, 10) + self.shouldFail(AssertionError, "test_compute_rate", "", + common.compute_rate, 100, -10) + + # Sanity check + rate = common.compute_rate(10*1000*1000, 1) + self.failUnlessReallyEqual(common.abbreviate_rate(rate), "10.00MBps") + def test_abbreviate_rate(self): self.failUnlessReallyEqual(common.abbreviate_rate(None), "") self.failUnlessReallyEqual(common.abbreviate_rate(1234000), "1.23MBps") diff --git a/src/allmydata/web/common.py b/src/allmydata/web/common.py index 8a0a9cb5..8e265679 100644 --- a/src/allmydata/web/common.py +++ b/src/allmydata/web/common.py @@ -90,6 +90,19 @@ def abbreviate_time(data): return "%.1fms" % (1000*s) return "%.0fus" % (1000000*s) +def compute_rate(bytes, seconds): + if bytes is None: + return None + + if seconds is None or seconds == 0: + return None + + # negative values don't make sense here + assert bytes > -1 + assert seconds > 0 + + return 1.0 * bytes / seconds + def abbreviate_rate(data): # 21.8kBps, 554.4kBps 4.37MBps if data is None: diff --git a/src/allmydata/web/status.py b/src/allmydata/web/status.py index 8af453c6..9f96f1da 100644 --- a/src/allmydata/web/status.py +++ b/src/allmydata/web/status.py @@ -5,7 +5,7 @@ from twisted.internet import defer from nevow import rend, inevow, tags as T from allmydata.util import base32, idlib from allmydata.web.common import getxmlfile, get_arg, \ - abbreviate_time, abbreviate_rate, abbreviate_size, plural + abbreviate_time, abbreviate_rate, abbreviate_size, plural, compute_rate from allmydata.interfaces import IUploadStatus, IDownloadStatus, \ IPublishStatus, IRetrieveStatus, IServermapUpdaterStatus @@ -110,12 +110,7 @@ class UploadResultsRendererMixin(RateAndTimeMixin): def _convert(r): file_size = r.file_size time = r.timings.get(name) - if time is None: - return None - try: - return 1.0 * file_size / time - except ZeroDivisionError: - return None + return compute_rate(file_size, time) d.addCallback(_convert) return d @@ -137,12 +132,10 @@ class UploadResultsRendererMixin(RateAndTimeMixin): file_size = r.file_size time1 = r.timings.get("cumulative_encoding") time2 = r.timings.get("cumulative_sending") - if (file_size is None or time1 is None or time2 is None): - return None - try: - return 1.0 * file_size / (time1+time2) - except ZeroDivisionError: + if (time1 is None or time2 is None): return None + else: + return compute_rate(file_size, time1+time2) d.addCallback(_convert) return d @@ -151,12 +144,7 @@ class UploadResultsRendererMixin(RateAndTimeMixin): def _convert(r): fetch_size = r.ciphertext_fetched time = r.timings.get("cumulative_fetch") - if (fetch_size is None or time is None): - return None - try: - return 1.0 * fetch_size / time - except ZeroDivisionError: - return None + return compute_rate(fetch_size, time) d.addCallback(_convert) return d @@ -308,12 +296,7 @@ class DownloadResultsRendererMixin(RateAndTimeMixin): def _convert(r): file_size = r.file_size time = r.timings.get(name) - if time is None: - return None - try: - return 1.0 * file_size / time - except ZeroDivisionError: - return None + return compute_rate(file_size, time) d.addCallback(_convert) return d @@ -433,7 +416,7 @@ class DownloadStatusPage(DownloadResultsRendererMixin, rend.Page): (start, length, requesttime, finishtime, bytes, decrypt, paused) = r_ev if finishtime is not None: rtt = finishtime - requesttime - paused - speed = self.render_rate(None, 1.0 * bytes / rtt) + speed = self.render_rate(None, compute_rate(bytes, rtt)) rtt = self.render_time(None, rtt) decrypt = self.render_time(None, decrypt) paused = self.render_time(None, paused) @@ -459,7 +442,7 @@ class DownloadStatusPage(DownloadResultsRendererMixin, rend.Page): elif etype == "delivery": if reqtime[0] == segnum: segtime = when - reqtime[1] - speed = self.render_rate(None, 1.0 * seglen / segtime) + speed = self.render_rate(None, compute_rate(seglen, segtime)) segtime = self.render_time(None, segtime) else: segtime, speed = "", "" @@ -595,12 +578,7 @@ class RetrieveStatusPage(rend.Page, RateAndTimeMixin): def _get_rate(self, data, name): file_size = self.retrieve_status.get_size() time = self.retrieve_status.timings.get(name) - if time is None or file_size is None: - return None - try: - return 1.0 * file_size / time - except ZeroDivisionError: - return None + return compute_rate(file_size, time) def data_time_total(self, ctx, data): return self.retrieve_status.timings.get("total") @@ -701,12 +679,7 @@ class PublishStatusPage(rend.Page, RateAndTimeMixin): def _get_rate(self, data, name): file_size = self.publish_status.get_size() time = self.publish_status.timings.get(name) - if time is None: - return None - try: - return 1.0 * file_size / time - except ZeroDivisionError: - return None + return compute_rate(file_size, time) def data_time_total(self, ctx, data): return self.publish_status.timings.get("total")