-/* Copyright (c) 2019-2021. The SimGrid Team. All rights reserved. */
+/* Copyright (c) 2019-2023. The SimGrid Team. All rights reserved. */
/* This program is free software; you can redistribute it and/or modify it
* under the terms of the license (GNU LGPL) which comes with this package. */
*/
class XBT_PUBLIC Disk : public xbt::Extendable<Disk> {
+#ifndef DOXYGEN
friend Engine;
friend Io;
friend kernel::resource::DiskImpl;
+#endif
explicit Disk(kernel::resource::DiskImpl* pimpl) : pimpl_(pimpl) {}
virtual ~Disk() = default;
Disk* set_write_bandwidth(double write_bw);
double get_write_bandwidth() const;
+ /**
+ * @brief Set limit for read/write operations.
+ *
+ * This determines the limit for read and write operation in the same disk.
+ * Usually, it's configured to max(read_bw, write_bw).
+ * You can change this behavior using this method
+ *
+ * @param bw New bandwidth for the disk
+ */
+ Disk* set_readwrite_bandwidth(double bw);
+
const std::unordered_map<std::string, std::string>* get_properties() const;
const char* get_property(const std::string& key) const;
Disk* set_property(const std::string&, const std::string& value);
Disk* set_state_profile(kernel::profile::Profile* profile);
Disk* set_read_bandwidth_profile(kernel::profile::Profile* profile);
Disk* set_write_bandwidth_profile(kernel::profile::Profile* profile);
+ /**
+ * @brief Set the max amount of operations (either read or write) that can take place on this disk at the same time
+ *
+ * Use -1 to set no limit.
+ */
+ Disk* set_concurrency_limit(int limit);
+ int get_concurrency_limit() const;
IoPtr io_init(sg_size_t size, s4u::Io::OpType type) const;
IoPtr read_async(sg_size_t size) const;
sg_size_t read(sg_size_t size) const;
+ sg_size_t read(sg_size_t size, double priority) const;
IoPtr write_async(sg_size_t size) const;
sg_size_t write(sg_size_t size) const;
+ sg_size_t write(sg_size_t size, double priority) const;
+
+ /** @brief Policy for sharing the disk among activities */
+ enum class SharingPolicy { NONLINEAR = 1, LINEAR = 0 };
+ enum class Operation { READ = 2, WRITE = 1, READWRITE = 0 };
+
+ /**
+ * @brief Describes how the disk is shared between activities for each operation
+ *
+ * Disks have different bandwidths for read and write operations, that can have different policies:
+ * - Read: resource sharing for read operation
+ * - Write: resource sharing for write
+ * - ReadWrite: global sharing for read and write operations
+ *
+ * Note that the NONLINEAR callback is in the critical path of the solver, so it should be fast.
+ *
+ * @param op Operation type
+ * @param policy Sharing policy
+ * @param cb Callback for NONLINEAR policies
+ */
+ Disk* set_sharing_policy(Operation op, SharingPolicy policy, const s4u::NonLinearResourceCb& cb = {});
+ SharingPolicy get_sharing_policy(Operation op) const;
+ /**
+ * @brief Callback to set IO factors
+ *
+ * This callback offers a flexible way to create variability in I/O operations
+ *
+ * @param size I/O operation size in bytes
+ * @param op I/O operation type: read or write
+ * @return Multiply factor
+ */
+ using IoFactorCb = double(sg_size_t size, Io::OpType op);
+ /** @brief Configure the factor callback */
+ Disk* set_factor_cb(const std::function<IoFactorCb>& cb);
Disk* seal();
/* The signals */
- /** @brief Callback signal fired when a new Disk is created */
+ /** @brief \static Add a callback fired when a new Disk is created */
+ static void on_creation_cb(const std::function<void(Disk&)>& cb) { on_creation.connect(cb); }
+ /** @brief \static Add a callback fired when any Disk is destroyed */
+ static void on_destruction_cb(const std::function<void(Disk const&)>& cb) { on_destruction.connect(cb); }
+ /** @brief Add a callback fired when this specific Disk is destroyed */
+ void on_this_destruction_cb(const std::function<void(Disk const&)>& cb) { on_this_destruction.connect(cb); }
+ /** @brief \static Add a callback fired when any Disk is turned on or off */
+ static void on_onoff_cb(const std::function<void(Disk const&)>& cb)
+ {
+ on_onoff.connect(cb);
+ }
+ /** @brief Add a callback fired when this specific Disk is turned on or off */
+ void on_this_onoff_cb(const std::function<void(Disk const&)>& cb)
+ {
+ on_this_onoff.connect(cb);
+ }
+
+ XBT_ATTRIB_DEPRECATED_v338("Please use on_onoff_cb() instead") static void on_state_change_cb(
+ const std::function<void(Disk const&)>& cb)
+ {
+ on_onoff.connect(cb);
+ }
+
+private:
static xbt::signal<void(Disk&)> on_creation;
- /** @brief Callback signal fired when a Disk is destroyed */
static xbt::signal<void(Disk const&)> on_destruction;
- /** @brief Callback signal fired when a Disk's state changes */
- static xbt::signal<void(Disk const&)> on_state_change;
+ xbt::signal<void(Disk const&)> on_this_destruction;
+ static xbt::signal<void(Disk const&)> on_onoff;
+ xbt::signal<void(Disk const&)> on_this_onoff;
};
} // namespace s4u
