7e36109b3c
This API (unexported) will estimate the amount of memory needed to execute
a search query over an index before the collector begins data collection.
Sample estimates for certain queries:
{Size: 10, BenchmarkUpsidedownSearchOverhead}
ESTIMATE BENCHMEM
TermQuery 4616 4796
MatchQuery 5210 5405
DisjunctionQuery (Match queries) 7700 8447
DisjunctionQuery (Term queries) 6514 6591
ConjunctionQuery (Match queries) 7524 8175
Nested disjunction query (disjunction of disjunctions) 10306 10708
…
92 lines
2.8 KiB
Go
92 lines
2.8 KiB
Go
// Copyright (c) 2014 Couchbase, Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package search
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import (
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"reflect"
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)
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var reflectStaticSizeDocumentMatchPool int
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func init() {
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var dmp DocumentMatchPool
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reflectStaticSizeDocumentMatchPool = int(reflect.TypeOf(dmp).Size())
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}
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// DocumentMatchPoolTooSmall is a callback function that can be executed
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// when the DocumentMatchPool does not have sufficient capacity
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// By default we just perform just-in-time allocation, but you could log
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// a message, or panic, etc.
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type DocumentMatchPoolTooSmall func(p *DocumentMatchPool) *DocumentMatch
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// DocumentMatchPool manages use/re-use of DocumentMatch instances
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// it pre-allocates space from a single large block with the expected
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// number of instances. It is not thread-safe as currently all
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// aspects of search take place in a single goroutine.
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type DocumentMatchPool struct {
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avail DocumentMatchCollection
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TooSmall DocumentMatchPoolTooSmall
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}
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func defaultDocumentMatchPoolTooSmall(p *DocumentMatchPool) *DocumentMatch {
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return &DocumentMatch{}
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}
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// NewDocumentMatchPool will build a DocumentMatchPool with memory
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// pre-allocated to accommodate the requested number of DocumentMatch
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// instances
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func NewDocumentMatchPool(size, sortsize int) *DocumentMatchPool {
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avail := make(DocumentMatchCollection, size)
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// pre-allocate the expected number of instances
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startBlock := make([]DocumentMatch, size)
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startSorts := make([]string, size*sortsize)
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// make these initial instances available
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i, j := 0, 0
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for i < size {
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avail[i] = &startBlock[i]
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avail[i].Sort = startSorts[j:j]
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i += 1
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j += sortsize
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}
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return &DocumentMatchPool{
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avail: avail,
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TooSmall: defaultDocumentMatchPoolTooSmall,
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}
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}
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// Get returns an available DocumentMatch from the pool
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// if the pool was not allocated with sufficient size, an allocation will
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// occur to satisfy this request. As a side-effect this will grow the size
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// of the pool.
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func (p *DocumentMatchPool) Get() *DocumentMatch {
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var rv *DocumentMatch
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if len(p.avail) > 0 {
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rv, p.avail = p.avail[len(p.avail)-1], p.avail[:len(p.avail)-1]
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} else {
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rv = p.TooSmall(p)
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}
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return rv
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}
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// Put returns a DocumentMatch to the pool
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func (p *DocumentMatchPool) Put(d *DocumentMatch) {
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if d == nil {
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return
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}
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// reset DocumentMatch before returning it to available pool
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d.Reset()
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p.avail = append(p.avail, d)
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}
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