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However, read request sizes and page cache sizes in mobile devices are much smaller than other platforms, which may decrease read-ahead efficiency and hurt user experience. The read-ahead efficiency is defined as hit pages \/ all pre-fetched pages in a sequential read. To study the efficiency of traditional read-ahead in mobile devices, this paper first observes that many pre-fetched pages are unused in page cache, which causes high page cache eviction ratio with high extra access latency. Then, this paper analyzes the factors that closely relate to the access latency. It is found that there exists a trade-off between read-ahead size and access latency. A size-tuning scheme is then proposed to explore this trade-off. Experimental results on real mobile devices have shown that the proposed scheme can reduce the number of pre-fetched pages and improve the efficiency of read-ahead without decreasing the page cache hit ratio.<\/jats:p>","DOI":"10.1145\/3373400.3373412","type":"journal-article","created":{"date-parts":[[2019,11,26]],"date-time":"2019-11-26T13:08:55Z","timestamp":1574773735000},"page":"75-80","update-policy":"https:\/\/doi.org\/10.1145\/crossmark-policy","source":"Crossref","is-referenced-by-count":0,"title":["Boosting read-ahead efficiency for improved user experience on mobile devices"],"prefix":"10.1145","volume":"16","author":[{"given":"Yu","family":"Liang","sequence":"first","affiliation":[{"name":"City University of Hong Kong"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Yajuan","family":"Du","sequence":"additional","affiliation":[{"name":"Wuhan University of Technology"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Chenchen","family":"Fu","sequence":"additional","affiliation":[{"name":"City University of Hong Kong"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Riwei","family":"Pan","sequence":"additional","affiliation":[{"name":"City University of Hong Kong"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Liang","family":"Shi","sequence":"additional","affiliation":[{"name":"Chongqing University"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Chun Jason","family":"Xue","sequence":"additional","affiliation":[{"name":"City University of Hong Kong"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"320","published-online":{"date-parts":[[2019,11,25]]},"reference":[{"key":"e_1_2_1_1_1","unstructured":"Daily tip: How to make your iphone camera launch instantly. http:\/\/www.tipb.com\/2011\/04\/20\/daily-tip-iphone-camera-launch-instantly-jailbreak\/.  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