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鍍金池/ 問答/ Linux問答
墨染殤 回答

curl "http://xxxx" -w "%{redirect_url}"

維他命 回答

1.剛買的這臺機器磁盤還用分區(qū)嗎?
不需要,直接使用即可

2.如果要分區(qū),大概要怎么來分區(qū)呢?
忽略

3.如果不用分區(qū),對以后磁盤擴容會有什么影響嗎?
一般服務器無非就是一些日志,一般40G也夠用了,如果你服務器需要存儲大量文件,建議你使用OSS文件存儲;
當然阿里云的服務器你也是可以之后購買磁盤進行擴容,沒有任何壓力。

痞性 回答

new is not an operator!

In c++, new and operator are both keywords. new int(x) is a(n) (new-)expression. operator new is a function. new operator in your title is new-expression indeed. new-expression will invoke oeprator new function.

placement new的作用就是在operator new分配好的內存上執(zhí)行對象的構造,
Yes, that's true. To help you understand, here is a sample:
char* ptr = new char[sizeof(T)]; // ptr use a new-expression(newchar [sizeof(T)] to allocate memory, char is guaranteed to be sizeof 1
T* tptr = new(ptr) T;            // Here is placement new

In a nutshell, placement new will use already allocated memory to construct the object. Where is the already allocated memory from? Either from new expression(free store) or allocated from activation record like int buffer[10], both ok.

那么new operator使用了operator new來申請內存之后是使用了placement new嗎?如果沒有話是怎么構造的呢?和placement new有關系嗎?

Above is my answer to your questions

BTW, from the case int buffer[10], we can see pre-new-expression is not a must for placement new(however, note that placement new itself is a new-expression, which will invoke operator new function because all it does is just construct here). If your question is "will placement new always be after operator new/new-expression", it will be a good question.

Update

One year ago, I was confused about how to combine operator new with the constructor then asked a question, FrankHB answered my question: https://tieba.baidu.com/p/508... Now, look back to this question, it is a X-Y question, what really confused me was how does new expression invoke constructor, so it is not related to placement new. Hope it will also inspire you.

Update again

所以我認為或許自己和您一年前的疑問相似,內存申請和構造函數(shù)這兩個過程是如何結合的呢?
the word combination(結合) is not properly now(I also make such mistake as said above), let me re-organize my wording:

new expression does two things:

  1. allocate memory
  2. initialization of the object

You and I(one year ago) are both confused about how does compiler initialize the object(via constructor or else) after allocating. Yes, I mentioned compiler, because C++ standard guarantee new will do the two things, but didn't how to, so, its compiler's work. So, it is not c++'s work, just compiler's. Now, we can see the assembly:

struct Foo
{
    Foo(int i) {}
};
int main()
{
    auto *a = new Foo(1);
}  

-O0:

Foo::Foo(int):
        push    rbp
        mov     rbp, rsp
        mov     QWORD PTR [rbp-8], rdi
        mov     DWORD PTR [rbp-12], esi
        pop     rbp
        ret
main:
        push    rbp
        mov     rbp, rsp
        push    rbx
        sub     rsp, 24
        mov     edi, 1
        call    operator new(unsigned long)
        mov     rbx, rax
        mov     esi, 1
        mov     rdi, rbx
        call    Foo::Foo(int)
        mov     QWORD PTR [rbp-24], rbx
        mov     eax, 0
        add     rsp, 24
        pop     rbx
        pop     rbp
        ret

codes related the new expression is follows: a

    mov     edi, 1
    call    operator new(unsigned long)
    mov     rbx, rax
    mov     esi, 1
    mov     rdi, rbx
    call    Foo::Foo(int)
    mov     QWORD PTR [rbp-24], rbx
    

Now, it is clear enough, right? assemble calls two procedures, oeprator new and Foo::Foo(int)

That's all, cheers!

So, your question is how the two combined?

刮刮樂 回答

https://unix.stackexchange.co...

參考這個,二樓給了個很不錯的方法查找環(huán)境變量在哪個文件存放。

ubuntu會加載的配置文件大概是/etc/profile,/etc/profile.d/*,/etc/bash.bashrc,/etc/environments,~/.profile,~/.bashrc

嘗試用grep -r找找看也行

壞脾滊 回答

不知道你用的什么系統(tǒng),我就假設是linux了(我用ubuntu):

1.修改好php.ini配置后,記得重啟一下fpm服務。記得找對正確的php.ini,因為一些linux發(fā)行版針對不同的sapi分別有不同的php.ini,你這個得找fpm SAPI的php.ini
2.其次是這個文件如果不存在,請嘗試手動創(chuàng)建,不要等php給你創(chuàng)建,他可能不會給你創(chuàng)建
3.然后是創(chuàng)建完畢后,建議你先給這個文件最大的權限,然后在php項目中故意寫個錯誤就行,看看能不能記錄錯誤到這個文件中
4.如果沒什么問題了,建議你收窄該文件的權限。其實把chown給fpm的用戶組/用戶即可

這里我這里記錄的錯誤:

圖片描述

默念 回答
Downloading binary from https://npm.taobao.org/mirrors/node-sass/v3.13.1/win32-x64-57_binding.node
Cannot download "https://npm.taobao.org/mirrors/node-sass/v3.13.1/win32-x64-57_binding.node":

HTTP error 404 Not Found

錯誤在這里,node-sass安裝包url找不到了,建議不要用cnpm,直接用npmyarn

任她鬧 回答

首先我得承認,目前本人思維還沒有完全沉浸于多線程環(huán)境里?,F(xiàn)在把這個過程重新描述一下:
1.創(chuàng)建單個任務實例時,傳遞的delayInMilliseconds值是從當前時間開始加上這個值得到的該任務最終應該執(zhí)行的時間。
2.這樣每個任務都會有一個自己的執(zhí)行時間點。接下來,Thread1開始執(zhí)行,那么剩下的 Thread2,Thread3 ……Thread 11 等一部分在Thread1執(zhí)行過程中 也已經到期了。那么最緊急的在最前面,最緊急的當然是 到期時間最長的。這里是 已經到期時間最長的意思。我之前理解錯了。
3.所以delay值最小的 一定是到期時間最長的了。

嘟尛嘴 回答

mysql默認語句最大長度是1m,2000條問題不大。但是你可以選擇用熟悉的語言來拼sql語句,從文件讀userid,這樣支持更多的userid,效率更高

鐧簞噯 回答

你說的掛掉是一個請求失敗還是整個進程死了?
如果一個一個請求失敗的話. 檢查是不是程序有使用長連接. redis. mysql 之類的. 有可能是連接空閑時間過長. 被斷開了.

浪蕩不羈 回答

pro()才是返回promise,pro是函數(shù),是函數(shù),是函數(shù)!

孤毒 回答
  1. asyncData 中的請求不是會在服務端 ssr 時發(fā)送一次嗎,這一次是不存在跨域問題的。
  2. 你在瀏覽器控制臺看到的提示應該是服務端數(shù)據(jù)請求失敗導致沒有 __INITIAL_STATE__ 導致的客戶端重發(fā),出現(xiàn)的跨域報錯。
  3. 第二段報錯信息你沒截取上的應該是 only one allowed,nginx 里還有別的設置 Access-Control-Allow-Origin 的地方嗎,是不是設置了兩遍?還是響應頭沒設置對。
慢半拍 回答

Unsupported compiler -- pybind11 requires C++11 support!

升級一下你的gcc吧

伐木累 回答

改錯文件了,改的是/usr/local/apache2/conf/http.conf,應該是/etc/httpd/conf/http.conf

葬愛 回答

兄dei,nodejs官方就有repo,何必自己編譯找虐?https://nodejs.org/en/downloa...

陌上花 回答

如果該遠程倉庫支持 ssh 連接的話,你要把你使用的私鑰對應的公鑰添加到這個遠程倉庫上,以使你有權限訪問該倉庫

舊螢火 回答
netstat -antp|grep 3306

上圖

阿里云的服務器?那你得到服務器安全組找找

澐染 回答

circle這個自定義函數(shù)調用方面的錯誤。