QObject真的有多重？ [英] How heavy is QObject really?

问题描述

我最近发表了一个关于QObject在典型使用情况下的开销的问题，但不幸的是，问题已经关闭，因为另一个问题的技术上没有回答这个问题。

$ b $更糟糕的是，匆忙的撒玛利亚人礼貌地匆忙关闭我的问题，打断了我刚刚在完成几个测试后输入的答案。由于我无法在我的原始问题中发布我的发现，我会在这里发布，以便其他人谁可能需要这些信息。

解决方案

很多人暗示QObject很重，但是没有任何清晰的确切的重。

• 未使用的QObject〜160字节


• 单个自动连接w / o参数〜235个字节


• 2个自动连接，参数大小为315个字节


• 3个自动连接3个参数〜400个字节


• 2个自动连接，1个排队，3个参数〜432个字节

这些数字应该考虑到我使用一个64位的Qt构建。

因此，总之，QObject的开销是相当重要的。没有任何东西可以打喷嚏或过度使用。

I recently posted a question about the overhead of QObject in typical usage scenarios, but unfortunately the question got closed as a duplicate of another question that didn't technically answer the question.

What is worse, the hasty "Samaritans" who politely rushed to close my question interrupted the answer I was just finishing typing after running a few tests. Since I can no longer post my findings in my original question, I'll post it here so it is available to others who might need that information.

解决方案

A lot of people have hinted at QObject being heavy, but without any clarity on how heavy is it exactly. So I did some measurements, not very accurate, all values are approximate.

• unused QObject ~160 bytes
• single auto connection w/o arguments ~235 bytes
• 2 auto connections w/o arguments ~315 bytes
• 3 auto connections, 1 with 3 arguments ~400 bytes
• 2 auto connections, 1 queued with 3 arguments ~432 bytes

Those numbers should take into account I am using a 64 bit Qt build.

So, in conclusion, the overhead of QObject is quite significant indeed. Nothing to sneeze at or overuse.

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