d2dbb8c963
* cli: initial work on debug; server-status target * debug: add metrics capture target (#7376) * check against DR secondary * debug: add compression * refactor check into preflight func * debug: set short test time on tests, fix exit code bug * debug: use temp dir for output on tests * debug: use mholt/archiver for compression * first pass on adding pprof * use logger for output * refactor polling target capture logic * debug: poll and collect replication status * debug: poll and collect host-info; rename output files and collection refactor * fix comments * add archive test; fix bugs found * rename flag name to singular target * add target output test; scaffold other tests cases * debug/test: add pprof and index file tests * debug/test: add min timing check tests * debug: fix index gen race and collection goroutine race * debug: extend archive tests, handle race between program exit and polling goroutines * update docstring * debug: correctly add to pollingWg * debug: add config target support * debug: don't wait on interrupt shutdown; add file exists unit tests * move pprof bits into its goroutine * debug: skip empty metrics and some pprof file creation if permission denied, add matching unit test * address comments and feedback * Vault debug using run.Group (#7658) * debug: switch to use oklog/run.Group * debug: use context to cancel requests and interrupt rungroups. * debug: trigger the first interval properly * debug: metrics collection should use metrics interval * debug: add missing continue on metrics error * debug: remove the use of buffered chan to trigger first interval * debug: don't shadow BaseCommand's client, properly block on interval capture failures * debug: actually use c.cachedClient everywhere * go mod vendor * debug: run all pprof in goroutines; bump pprof timings in tests to reduce flakiness * debug: update help text
54 lines
1.5 KiB
Go
54 lines
1.5 KiB
Go
// Copyright 2014-2017 Ulrich Kunitz. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package lzma
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// movebits defines the number of bits used for the updates of probability
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// values.
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const movebits = 5
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// probbits defines the number of bits of a probability value.
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const probbits = 11
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// probInit defines 0.5 as initial value for prob values.
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const probInit prob = 1 << (probbits - 1)
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// Type prob represents probabilities. The type can also be used to encode and
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// decode single bits.
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type prob uint16
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// Dec decreases the probability. The decrease is proportional to the
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// probability value.
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func (p *prob) dec() {
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*p -= *p >> movebits
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}
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// Inc increases the probability. The Increase is proportional to the
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// difference of 1 and the probability value.
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func (p *prob) inc() {
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*p += ((1 << probbits) - *p) >> movebits
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}
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// Computes the new bound for a given range using the probability value.
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func (p prob) bound(r uint32) uint32 {
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return (r >> probbits) * uint32(p)
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}
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// Bits returns 1. One is the number of bits that can be encoded or decoded
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// with a single prob value.
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func (p prob) Bits() int {
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return 1
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}
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// Encode encodes the least-significant bit of v. Note that the p value will be
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// changed.
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func (p *prob) Encode(e *rangeEncoder, v uint32) error {
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return e.EncodeBit(v, p)
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}
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// Decode decodes a single bit. Note that the p value will change.
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func (p *prob) Decode(d *rangeDecoder) (v uint32, err error) {
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return d.DecodeBit(p)
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}
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