namespace simgrid {
namespace mc {
-/** A byte-string represented as a sequence of chunks from a PageStor */
+/** A byte-string represented as a sequence of chunks from a PageStore
+ *
+ * In order to save memory when taking memory snapshots, a given byte-string
+ * is split in fixed-size chunks. Identical chunks (either from the same
+ * snapshot or more probably from different snpashots) share the same memory
+ * storage.
+ *
+ * Thus a chunked is represented as a sequence of indices of each chunk.
+ */
class ChunkedData {
+ /** This is where we store the chunks */
PageStore* store_ = nullptr;
- /** Indices of the chunks */
+ /** Indices of the chunks in the `PageStore` */
std::vector<std::size_t> pagenos_;
public:
return *this;
}
+ /** How many pages are used */
std::size_t page_count() const { return pagenos_.size(); }
+
+ /** Get a chunk index */
std::size_t pageno(std::size_t i) const { return pagenos_[i]; }
+
+ /** Get a view of the chunk indices */
const std::size_t* pagenos() const { return pagenos_.data(); }
+ /** Get a a pointer to a chunk */
const void* page(std::size_t i) const
{
return store_->get_page(pagenos_[i]);
