When you free() a small allocation through the standard heap, the heap manager keeps the page around for reuse. Over time, this fragments badly and you end up with 256MB of RAM full of holes. By allocating in raw 4KB physical pages, every free genuinely returns the memory. The tradeoff is waste: a chunk that compresses to 4.1KB needs an 8KB allocation. But they measured it:
3月21日,俄罗斯总统弗拉基米尔·普京在致伊朗最高领袖穆杰塔巴·哈梅内伊及总统马苏德·佩泽希奇安的函件中,祝愿伊朗人民能够妥善应对严峻考验。
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Иллюстрация: Виталий Тимкив / РИА Новости
第七十八条 除依据本法第七十六条的规定作出批注外,承运人或者代其签发提单的人签发的提单,是承运人已经按照提单所载状况收到货物或者货物已经装船的初步证据;承运人向包括收货人在内的善意第三人提出的货物状况与提单记载不同的证据,不予承认。