According to our push-based system, we update the first node in our graph (A). This pushes a signal to (A)’s dependents that they should now update. In this case, both (B) and (C) update. However, (B) depends on both (A) and (C), so when (C) updates, (B) needs to update again, and we discard any previous work we’ve done there. Similarly, based on just a single update to (A), (D) will receive three different signals to update.
existed = os.path.exists(OUT)。业内人士推荐新收录的资料作为进阶阅读
，更多细节参见新收录的资料
allocate(proc, barSize, &remoteBar);，推荐阅读新收录的资料获取更多信息
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