get rid of gox
build target builds inside docker, dev-build - locally
Revert "build target builds inside docker, dev-build - locally"
This reverts commit 8ba89d5e8c5668e3839ff49952a9166d1158f6e8.
add build tags to make build/build_race/install
use tendermint's fork of glide instead of tar.gz
remove TMHOME unused var + set length for git hash
get rid of GOTOOLS_CHECK
fixes after review
zip
needed for distribution
Fixes https://github.com/tendermint/tendermint/issues/1189
For every TxEventBuffer.Flush() invoking, we were invoking
a:
b.events = make([]EventDataTx, 0, b.capacity)
whose intention is to innocently clear the events slice but
maintain the underlying capacity.
However, unfortunately this is memory and garbage collection intensive
which is linear in the number of events added. If an attack had access
to our code somehow, invoking .Flush() in tight loops would be a sure
way to cause huge GC pressure, and say if they added about 1e9
events maliciously, every Flush() would take at least 3.2seconds
which is enough to now control our application.
The new using of the capacity preserving slice clearing idiom
takes a constant time regardless of the number of elements with zero
allocations so we are killing many birds with one stone i.e
b.events = b.events[:0]
For benchmarking results, please see
https://gist.github.com/odeke-em/532c14ab67d71c9c0b95518a7a526058
for a reference on how things can get out of hand easily.
https://play.golang.org/p/gN21yO9IRs3
```
func waitWithCancel(f func() *clist.CElement, ctx context.Context) *clist.CElement {
el := make(chan *clist.CElement, 1)
select {
case el <- f():
```
will just run f() blockingly, so this doesn't change much in terms of behavior.
Leaking goroutine:
```
114 @ 0x42f2bc 0x42f3ae 0x440794 0x4403b9 0x468002 0x9fe32d 0x9ff78f 0xa025ed 0x45e571
```
Explanation:
it blocks on an empty clist forever. so unless theres txs coming in,
this go routine will just sit there, holding onto the peer too.
if we're constantly reconnecting to some peer, old instances are not
garbage collected, leading to memory leak.
Fixes https://github.com/cosmos/gaia/issues/108
Previous attempt https://github.com/tendermint/tendermint/pull/1156
