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([2804:1b3:a7c3:b18e:ec2c:788a:1fcc:a268]) by smtp.gmail.com with ESMTPSA id j11-20020a170902da8b00b001d8edfec673sm11091935plx.214.2024.04.02.07.15.58 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 02 Apr 2024 07:15:59 -0700 (PDT) Message-ID: <2b5dde8f-2d72-4c76-bb93-347eade87a8f@linaro.org> Date: Tue, 2 Apr 2024 11:15:56 -0300 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] stdlib: reorganize stdlib Makefile routines by functionality To: abush wang , abushwang via Libc-alpha , "H.J. Lu" , Florian Weimer References: Content-Language: en-US From: Adhemerval Zanella Netto Organization: Linaro In-Reply-To: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-Spam-Status: No, score=-5.2 required=5.0 tests=BAYES_00,DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_NONE,SPF_HELO_NONE,SPF_PASS,TXREP autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on server2.sourceware.org List-Id: On 01/04/24 08:47, abush wang wrote: > This is test: > ``` > uint64_t getnsecs() { >     uint32_t lo, hi; >     __asm__ __volatile__ ( >         "rdtsc" : "=a"(lo), "=d"(hi) >     );   >     return ((uint64_t)hi << 32) | lo; > } > > int main() { >     const int num_iterations = 1; This low number of iteration makes the benchmark pretty much useless on modern hardware with frequency scaling. By raising to something like 1000000000 I see no variation on my workstation (Ryzen 5900). >     uint64_t start, end, total_time = 0; > >     start = getnsecs(); >     for (int i = 0; i < num_iterations; i++) { >         (void) lrand48(); >     } >     end = getnsecs(); >     total_time += (end - start); > >     printf("Average time for lrand48: %lu cycles\n", total_time / num_iterations); >     return 0; > } > ``` > before: > Average time for lrand48: 21418 cycles > > after: > Average time for lrand48: 9892 cycles