umegaya

FROM ubuntu:xenial

RUN apt-get update && apt-get install -y wget libgmp-dev && \
	wget https://s3-ap-southeast-2.amazonaws.com/protobuf-solidity/packages/debian/solpb-0.5.0-linux-x86_64.deb && \
    dpkg -i solpb-0.5.0-linux-x86_64.deb && \
	rm -rf /var/lib/apt/lists/*

umegaya

cv.wait***から抜けたあと、この関数に渡していたunique_lockはlockされているが、これはwakeupと不可分に起きるわけではない。
例えば他のスレッドが対応するmutexをロックするようなコードを実行していると、以下のようなフローが発生しうる
cv.notifyXXX 呼び出し => cv.waitXXX が再開 => __cv.waitXXXに渡されていたlockを他のスレッドが取得 => cv.waitXXXの中で、再開されたスレッドがlockを取得
したがって以下のようなコードでXが完了するまでYが実行されないことを保証することはできない
{
  unique_lock lock(mutex);
  cv.wait(lock, predicate);
  //X
}

umegaya

package ns;
service Hoge {
	rpc Foo(FooReq) returns (FooRep) {}
  rpc Bar(BarReq) returns (BarRep) {}
}

|
V

#### client

umegaya

11/13
300 client/13 byte records, 1 server process, 1 client process

dokyougemusu-no-MacBook-Pro:naquid iyatomi$ ./test/e2e/client/build/client 
process 140841 requests average 1.707306 sec
dokyougemusu-no-MacBook-Pro:naquid iyatomi$ ./test/e2e/client/build/client 
process 150644 requests average 1.564081 sec
dokyougemusu-no-MacBook-Pro:naquid iyatomi$ ./test/e2e/client/build/client 
process 146526 requests average 1.580449 sec
dokyougemusu-no-MacBook-Pro:naquid iyatomi$ ./test/e2e/client/build/client 

umegaya

find $SEARCH_DIR -name "$FILE_PATTERN" -exec sh -c 'echo mv "$1" "$(echo "$1" | sed s/$PATTERN/$REPLACE/)"' _ {} \; 

複数引数の例
for i in {2..12} ; do
	find . -name "food[1-6].png" -exec sh -c 'cp "$1" "$(echo "$1" | sed s#food#$2/food_$2_#)"' _ {} $i \;
done

umegaya

J / K = Entropy

S1, S2 .. have same Entropy
K1 > K2 <=> J1 > J2

J => 保存される(第1法則)
E => 増大する(第2法則)
K => 減りつづけるということ

umegaya

#### tl;dr
例えばapiserverなら

```
sudo bash -c "GOPATH=/var/src/apiserver:/master-release/src/go/Godeps/_workspace/ go build -ldflags '-X github.com/GoogleCloudPlatform/kubernetes/pkg/version.gitCommit 431caa93dfdbe86e14c8041e64ba10bcc80a7b40 -X github.com/GoogleCloudPlatform/kubernetes/pkg/version.gitTreeState dirty -X github.com/GoogleCloudPlatform/kubernetes/pkg/version.gitVersion v0.3-111-g431caa93dfdbe8-dirty -X github.com/GoogleCloudPlatform/kubernetes/pkg/version.gitMajor 0 -X github.com/GoogleCloudPlatform/kubernetes/pkg/version.gitMinor 3+' github.com/GoogleCloudPlatform/kubernetes/cmd/apiserver"
```
でリビルドできる。

#### 背景
kubernetesを使っているとまだ、ちょっとしたバグを修正したいときがあるのですが、

umegaya

### settings that cause trouble if you leave them default
- VPC
  - DNS hostname => set to yes
- VPC subnet
  - auto-assign public ip => set to yes
- VPC route table
  - create internet gateway and attach it to route table. otherwise no one can connect instance which has this VPC

umegaya

dokyougemusu-no-MacBook-Pro:mono iyatomi$ sudo make install
Password:
Sorry, try again.
Password:
Sorry, try again.
Password:
Making install in po
Making install in mcs
if test "mono" = "gettext-tools"; then \
      ../.././install-sh -c -d /usr/local/share/gettext/po; \

umegaya

MachineId:8D9D94EBA24784C622132CA54BB54571
EpicAccountId:867f7c487d6b4555a177a07a11527560

 SEGV_MAPERR at 0x3

FGenericPlatformMisc::RaiseException(unsigned int) Address = 0x109fc3dab (filename not found) [in UE4Editor-Core.dylib]
FOutputDeviceMacError::Serialize(wchar_t const*, ELogVerbosity::Type, FName const&) Address = 0x10a17c378 (filename not found) [in UE4Editor-Core.dylib]
FOutputDevice::Logf(wchar_t const*, ...) Address = 0x10a259d17 (filename not found) [in UE4Editor-Core.dylib]
FDebug::AssertFailed(char const*, char const*, int, wchar_t const*, ...) Address = 0x10a1d8b7e (filename not found) [in UE4Editor-Core.dylib]
__31-[FCocoaTextView selectedRange]_block_invoke Address = 0x10a108b1f (filename not found) [in UE4Editor-Core.dylib]