The paper presents a series of experiments to analyze the performance
of IO operations (read/write) on different kinds of disks (SATA, SAS,
- SSD). In this tutorial, we show how to extract this data to simulate
- both performance degradation with concurrent operations (Fig. 8 in the
- paper) and variability in IO operations (Fig. 5 to 7).
+ SSD). In this tutorial, we present a detailed example of how to
+ extract experimental data to simulate: i) performance degradation
+ with concurrent operations (Fig. 8 in the paper) and ii) variability
+ in IO operations (Fig. 5 to 7).
- Link for paper: https://hal.inria.fr/hal-01197128
- Link for data: https://figshare.com/articles/dataset/Companion_of_the_SimGrid_storage_modeling_article/1175156
- *WARNING*: The purpose of this document is to illustrate how we can
+ *Disclaimer*:
+- The purpose of this document is to illustrate how we can
extract data from experiments and inject on SimGrid. However, the
- results may *not* reflect the reality.
+ data shown on this page may *not* reflect the reality.
+- You must run similar experiments on your hardware to get realistic
+ data for your context.
+- SimGrid has been in active development since the paper release in
+ 2015, thus the MSG and XML description used in the paper may have
+ evolved and may not be available anymore.
*** Running this tutorial
The paper presents a series of experiments to analyze the performance
of IO operations (read/write) on different kinds of disks (SATA, SAS,
-SSD). In this tutorial, we show how to extract this data to simulate
-both performance degradation with concurrent operations (Fig. 8 in the
-paper) and variability in IO operations (Fig. 5 to 7).
+SSD). In this tutorial, we present a detailed example of how to
+extract experimental data to simulate: i) performance degradation
+with concurrent operations (Fig. 8 in the paper) and ii) variability
+in IO operations (Fig. 5 to 7).
- Link for paper: `https://hal.inria.fr/hal-01197128 <https://hal.inria.fr/hal-01197128>`_
- Link for data: `https://figshare.com/articles/dataset/Companion_of_the_SimGrid_storage_modeling_article/1175156 <https://figshare.com/articles/dataset/Companion_of_the_SimGrid_storage_modeling_article/1175156>`_
-**WARNING**: The purpose of this document is to illustrate how we can
-extract data from experiments and inject on SimGrid. However, the
-results may **not** reflect the reality.
+**Disclaimer**:
+
+- The purpose of this document is to illustrate how we can
+ extract data from experiments and inject on SimGrid. However, the
+ data shown on this page may **not** reflect the reality.
+
+- You must run similar experiments on your hardware to get realistic
+ data for your context.
+
+- SimGrid has been in active development since the paper release in
+ 2015, thus the MSG and XML description used in the paper may have
+ evolved and may not be available anymore.
Running this tutorial
^^^^^^^^^^^^^^^^^^^^^
XBT_INFO("Setting readwrite limit to half (.5e6) in the middle of IO. Read and write should take 1.5s");
cur_time = sg4::Engine::get_clock();
- act = disk->write_async(1e6 / 2);
- sg4::IoPtr act2 = disk->read_async(1e6 / 2);
+ act = disk->write_async(.5e6);
+ sg4::IoPtr act2 = disk->read_async(.5e6);
sg4::this_actor::sleep_for(.5);
disk->set_readwrite_bandwidth(.5e6);
act->wait();
